Added CI readme

CI.md

@@ -0,0 +1,40 @@
+# Continuous Integration
+
+Each service or productive piece of software should be automatically tested, before merged to `develop`. We use [AWS CodeBuild](https://docs.aws.amazon.com/fr_fr/codebuild/) for building/testing code. For every software we have two Codebuild projects
+
+- One which is triggered by Pull Request CREATE and UPDATE event
+  - This one lint, check formatting, build and test the code
+- One which is triggered by Pull Request merge event
+  - This one build and release the build artefact (release on S3 build artifact or ECR repository)
+
+## Table of contents
+
+- [Table of contents](#table-of-contents)
+- [Guidelines](#guidelines)
+- [Build Badge](#build-badge)
+
+## Guidelines
+
+- Each Codebuild project is managed via terraform in a dedicated repository
+- `buildspec.yml` file is located within the terraform module of the Codebuild project which is in a private repository. This ensure security where a non authorized person cannot see and edit the buildspec and trigger a build on a public repository.
+- Don't use secrets/password inside the buildspec but use AWS SSM [AWS System Manager (SSM)](https://docs.aws.amazon.com/systems-manager/index.html)
+- Use build badge in the software github repository see [Build Badge](#build-badge)
+
+## Build Badge
+
+Build badge should be added to the top of the README.md file of the github project using the following template:
+
+```md
+| Branch | Status |
+|--------|-----------|
+| develop | ![Build Status](BADGE_LINK) |
+| master | ![Build Status](BADGE_LINK) |
+```
+
+To get the badge login to the [AWS Console](https://console.aws.amazon.com) on the account managing Codebuild and navigate to the Codebuild project (make sure you are on the correct AWS zone `eu-central-1`). Then on the project main page click on `Copy badge URL`. This link looks as follow:
+
+```bash
+https://codebuild.eu-central-1.amazonaws.com/badges?uuid=eyJl...I6MX0%3D&branch=master
+```
+
+Change the branch at the end of the link accordingly.

README.md

@@ -19,3 +19,4 @@ Geoadmin PP BGDI general and coding guidelines.
    3. [Git Flow](GIT_FLOW.md)
    4. [Github Workflows](GITHUB_WORKFLOW.md)
 3. [Versioning and release](VERSIONING_RELEASE.md)
+4. [CI](CI.md)