DOC: issue template (xorbitsai#76)

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: "[BUG]"
+labels: ''
+assignees: ''
+
+---
+
+### Describe the bug
+A clear and concise description of what the bug is.
+
+### To Reproduce
+To help us to reproduce this bug, please provide information below:
+
+1. Your Python version.
+2. The version of Plexar you use.
+3. Versions of crucial packages.
+4. Full stack of the error.
+5. Minimized code to reproduce the error.
+
+### Expected behavior
+A clear and concise description of what you expected to happen.
+
+### Additional context
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+### Is your feature request related to a problem? Please describe
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+### Describe the solution you'd like
+A clear and concise description of what you want to happen.
+
+### Describe alternatives you've considered
+A clear and concise description of any alternative solutions or features you've considered.
+
+### Additional context
+Add any other context or screenshots about the feature request here.

.github/ISSUE_TEMPLATE/other.md

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+---
+name: Other
+about: Submit other issues here.
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+Note that the issue tracker is NOT the place for general support.