Update issue templates (dotimplement#64)

Addresses issue dotimplement#62

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,40 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+## Description
+<!-- Short description of the problem here. -->
+
+## Context
+<!-- How has this bug affected you? What were you trying to accomplish? -->
+
+## Steps to Reproduce
+<!-- 1. [First Step]
+2. [Second Step]
+3. [And so on...] -->
+
+## Expected Result
+<!-- Tell us what should happen. -->
+
+## Actual Result
+<!-- Tell us what happens instead. -->
+
+```
+-- If you received an error, place it here.
+```
+
+```
+-- Separate them if you have more than one.
+```
+
+## Your Environment
+<!-- Include as many relevant details about the environment in which you experienced the bug: -->
+
+* Healthchain version used (`pip show healthchain`):
+* Python version used (`python -V`):
+* Operating system and version:

.github/ISSUE_TEMPLATE/documentation-improvement.md

@@ -0,0 +1,16 @@
+---
+name: Documentation Improvement
+about: Suggest an improvement to the documentation
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+## Description
+<!-- Short description of the improvement suggestion. -->
+
+### Documentation page (if applicable)
+
+## Context
+<!-- Extra context. -->

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,20 @@
+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+## Description
+<!-- Is your feature request related to a use case which is difficult to implement?  "I am trying to do XYZ and am finding it difficult to ..." -->
+
+## Context
+<!-- Why is this change important to you? How would you use it? How can it benefit other users? -->
+
+## Possible Implementation
+<!-- (Optional) Suggest an idea for implementing the addition or change. -->
+
+## Possible Alternatives
+<!-- (Optional) Describe any alternative solutions or features you've considered. -->