[MI-3573] Add issue template (#333)

* [MI-3573] Add issue template

* [MI-3573] Minor review fixes

* [MI-3573] Fix issue in assignee

* [MI-3573] Add some more info in the template

* [MI-3573] Add link for bug report doc template

* [MI-3573] Fix test cases

docs/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,46 @@
+---
+name: Bug report
+about: Create an issue to report the bug
+title: 'Bug: '
+labels: Bug, Triage
+assignees: '@username'
+
+---
+
+## Steps to reproduce the bug
+
+1. Go to ...
+2. Select  ...
+3. Scroll down to ...
+4. See error
+
+## Expected behaviour
+
+A clear and concise description of what you expected to happen.
+
+## Actual behaviour
+
+A clear and concise description of what actually happened.
+
+## Screenshots (optional)
+
+If applicable, add screenshots or a screen recording to elaborate on the problem.
+
+## Mattermost Version and other Platforms
+
+ - Mattermost Version: [e.g. v7.8.10]
+ - Browser and OS: [e.g. Chrome on Mac, Edge on Windows]
+
+## Additional context
+
+Add any other context about the problem here, and any notes about the severity:
+- Timestamp during which the issue occurred.
+- Mattermost username or user ID
+- MS Teams username or user ID
+- Platform from where the message originated
+- Sev 1: Affects critical functionality without a workaround
+- Sev 2: Affects major functionality with a difficult or non-obvious workaround
+- Sev 3: Affects minor, non-critical functionality
+
+## To report a bug with any confidential information, please create a copy of the below document and report a bug.
+https://docs.google.com/document/d/1gCinrfY6n69sDY_5DTV2vns5dRewteQyYeta-HbbUAM/edit?usp=sharing

docs/ISSUE_TEMPLATE/enhancement.md

@@ -0,0 +1,25 @@
+---
+name: Enhancement/Feature Idea
+about: Suggest a new feature
+title: 'Feature Idea: '
+labels: Enhancement, Triage
+assignees: ''
+
+---
+
+## Summary
+
+Describe the new feature.
+
+## How important this is to me and why
+
+Importance: High/Medium/Low
+
+Use cases:
+1.
+2.
+3.
+
+## Additional context/similar features
+
+Any examples of good implementations of this feature.