Add GitHub issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve Citizen
+title: ''
+labels: bug
+assignees: ''
+---
+
+## Describe the Bug
+A clear and concise description of what the bug is. If applicable, add screenshots to help explain your problem.
+
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+## Expected Behavior
+A clear and concise description of what you expected to happen.
+
+## System
+_Please complete the following information:_
+ - MediaWiki version [e.g. v1.33.1]
+ - Server OS: [e.g. Debian 10]
+ - Installed extensions and versions [e.g. SemanticMediaWiki 3.0, WikiSEO 2.3.1, etc.]
+ - PHP version [e.g. v7.2.19-0ubuntu0.18.04.2]

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for Citizen
+title: ''
+labels: enhancement
+assignees: ''
+---
+
+## The Problem
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+## The Solution
+A clear and concise description of what you want to happen.
+
+## The Alternatives
+A clear and concise description of any alternative solutions or features you've considered.