Improve documentation (#206)

* Create CONTRIBUTING.md
* Add PR template
* Tweak .yamllint
* Update README playbook examples

Author: alessfg

.github/pull_request_template.md

@@ -0,0 +1,10 @@
+### Proposed changes
+Describe the use case and detail of the change. If this PR addresses an issue on GitHub, make sure to include a link to that issue here in this description (not in the title of the PR).
+
+### Checklist
+Before creating a PR, run through this checklist and mark each as complete.
+
+-   [ ] I have read the [CONTRIBUTING](https://github.com/nginxinc/ansible-role-nginx/blob/master/CONTRIBUTING.md) document
+-   [ ] I have added Molecule tests that prove my fix is effective or that my feature works
+-   [ ] I have checked that all unit tests pass after adding my changes
+-   [ ] If required, I have updated necessary documentation (`defaults/main/` and `README.md`)

.yamllint

@@ -7,7 +7,6 @@ rules:
   brackets:
     max-spaces-inside: 1
     level: error
-  comments: disable
   comments-indentation: disable
   line-length: disable
   truthy: disable

CONTRIBUTING.md

@@ -0,0 +1,72 @@
+# Contributing Guidelines
+
+The following is a set of guidelines for contributing to the NGINX Ansible role. We really appreciate that you are considering contributing!
+
+#### Table Of Contents
+
+[Ask a Question](#ask-a-question)
+
+[Getting Started](#getting-started)
+
+[Contributing](#contributing)
+
+[Code Guidelines](#code-guidelines)
+*   [Git Guidelines](#git-guidelines)
+*   [Ansible Guidelines](#ansible-guidelines)
+
+[Code of Conduct](https://github.com/nginxinc/ansible-role-nginx/blob/master/CODE_OF_CONDUCT.md)
+
+## Ask a Question
+
+Please open an Issue on GitHub with the label `question`.
+
+## Getting Started
+
+Follow our [Installation Guide](https://github.com/nginxinc/ansible-role-nginx/blob/master/README.md#Installation) to install Ansible and Molecule and get ready to use the NGINX Ansible role.
+
+### Project Structure
+
+*   The NGINX Ansible role is written in `yaml` and supports open source NGINX, NGINX Plus, NGINX Amplify, NGINX Controller, and NGINX Unit.
+*   The project follows the standard [Ansible role directory structure](https://docs.ansible.com/ansible/latest/user_guide/playbooks_reuse_roles.html)
+    *   The main code is found at `tasks/`
+    *   The main variables can be found at `defaults/main/`
+    *   Configuration templates for NGINX can be found at `templates/`
+    *   [Molecule](https://molecule.readthedocs.io/) tests can be found in `molecule/`.
+    *   CI/CD is done via Travis using `.travis.yml` Deployment yaml files, and Helm files are found at `deployments/`
+
+## Contributing
+
+### Report a Bug
+
+To report a bug, open an issue on GitHub with the label `bug` using the available bug report issue template. Please ensure the issue has not already been reported.
+
+### Suggest an Enhancement
+
+To suggest an enhancement, please create an issue on GitHub with the label `enhancement` using the available feature issue template.
+
+### Open a Pull Request
+
+*   Fork the repo, create a branch, submit a PR when your changes are tested and ready for review
+*   Fill in [our pull request template](https://github.com/nginxinc/ansible-role-nginx/blob/master/.github/PULL_REQUEST_TEMPLATE.md)
+
+Note: if you’d like to implement a new feature, please consider creating a feature request issue first to start a discussion about the feature.
+
+## Code Guidelines
+
+### Git Guidelines
+
+*   Keep a clean, concise and meaningful git commit history on your branch (within reason), rebasing locally and squashing before submitting a PR
+*   Follow the guidelines of writing a good commit message as described here <https://chris.beams.io/posts/git-commit/> and summarised in the next few points
+    *   In the subject line, use the present tense ("Add feature" not "Added feature")
+    *   In the subject line, use the imperative mood ("Move cursor to..." not "Moves cursor to...")
+    *   Limit the subject line to 72 characters or less
+    *   Reference issues and pull requests liberally after the subject line
+    *   Add more detailed description in the body of the git message (`git commit -a` to give you more space and time in your text editor to write a good message instead of `git commit -am`)
+
+### Ansible Guidelines
+
+*   Run `molecule lint` over your code to automatically resolve a lot of `yaml` and Ansible style issues.
+*   Run `molecule test --all` on your code to catch any other issues.
+*   Follow these guides on some good practices for Ansible:
+    *   <https://www.ansible.com/blog/ansible-best-practices-essentials>
+    *   <https://docs.ansible.com/ansible/latest/user_guide/playbooks_best_practices.html>

README.md

@@ -13,14 +13,29 @@ Requirements
 
 **Ansible**
 
-This role was developed and tested with [maintained](https://docs.ansible.com/ansible/latest/reference_appendices/release_and_maintenance.html#release-status) versions of
-Ansible. Backwards compatibility is not guaranteed.
+This role was developed and tested with [maintained](https://docs.ansible.com/ansible/latest/reference_appendices/release_and_maintenance.html#release-status) versions of Ansible. Backwards compatibility is not guaranteed.
+
+Instructions on how to install Ansible can be found in the [Ansible website](https://docs.ansible.com/ansible/latest/installation_guide/intro_installation.html).
+
+**Molecule**
+
+Molecule is used to test the various functionailities of the role. Instructions on how to install Molecule can be found in the [Molecule website](https://molecule.readthedocs.io/en/stable/installation.html).
+
+Installation
+------------
 
 **Ansible Galaxy**
 
-Use `ansible-galaxy install nginxinc.nginx` to install the role on your system.
+Use `ansible-galaxy install nginxinc.nginx` to install the latest stable release of the role on your system.
+
+**Git**
 
-It supports all platforms supported by [NGINX Open Source](https://nginx.org/en/linux_packages.html#mainline) and [NGINX Plus](https://www.nginx.com/products/technical-specs/):
+Use `git clone https://github.com/nginxinc/ansible-role-nginx.git` to pull the latest edge commit of the role from GitHub.
+
+Platforms
+---------
+
+The NGINX Ansible role supports all platforms supported by [NGINX Open Source](https://nginx.org/en/linux_packages.html#mainline), [NGINX Plus](https://www.nginx.com/products/technical-specs/), the [NGINX Amplify agent](https://github.com/nginxinc/nginx-amplify-doc/blob/master/amplify-faq.md#21-what-operating-systems-are-supported), the [NGINX Controller agent](https://docs.nginx.com/nginx-controller/technical-specs/#nginx-controller-agent-technical-specifications), and [NGINX Unit](https://unit.nginx.org/installation/#official-packages):
 
 **NGINX Open Source**
 
@@ -120,7 +135,6 @@ Debian:
     - stretch
 Ubuntu:
   versions:
-    - trusty
     - xenial
     - bionic
 RedHat:
@@ -245,18 +259,23 @@ This is a sample playbook file for deploying the Ansible Galaxy NGINX role in a
         template_file: http/default.conf.j2
         conf_file_name: default.conf
         conf_file_location: /etc/nginx/conf.d/
-        port: 80
-        server_name: localhost
-        error_page: /usr/share/nginx/html
-        autoindex: false
-        web_server:
-          locations:
-            default:
-              location: /
-              html_file_location: /usr/share/nginx/html
-              html_file_name: index.html
-              autoindex: false
-          http_demo_conf: false
+        servers:
+          server1:
+            listen:
+              listen_localhost:
+                # ip: 0.0.0.0
+                port: 80
+            server_name: localhost
+            error_page: /usr/share/nginx/html
+            autoindex: false
+            web_server:
+              locations:
+                default:
+                  location: /
+                  html_file_location: /usr/share/nginx/html
+                  html_file_name: index.html
+                  autoindex: false
+              http_demo_conf: false
 ```
 
 This is a sample playbook file for deploying the Ansible Galaxy NGINX role in a localhost and installing the open source version of NGINX as a reverse proxy.
@@ -278,7 +297,7 @@ This is a sample playbook file for deploying the Ansible Galaxy NGINX role in a
           server1:
             listen:
               listen_localhost:
-                #ip: 0.0.0.0
+                # ip: 0.0.0.0
                 port: 80
                 opts:
                   - default_server