Create bug.md

.github/ISSUE_TEMPLATE/bug.md

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+---
+name: Bug
+about: Some functionality not working as intended
+title: ''
+labels: 'bug'
+assignees: ''
+
+---
+
+## Description
+A clear and concise description of the bug.
+
+## How to Reproduce
+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.
+
+## Screenshots
+If applicable, add screenshots to help explain your problem.
+
+## System Information
+ - OS: [e.g. iOS]
+ - OS Version: [e.g. 22]
+ - Browser (if applicable): [e.g. Google Chrome]
+ - Browser Version (if applicable): [e.g. 81.0.4044.138]
+ - Language Version: [e.g. Python 3.7, Node 10.18.1]
+ - Package Manager Version: [e.g. Conda 4.6.1, NPM 6.14.1]
+
+## Additional Context
+Add any other context about the problem here.