add github templates

Author: liwenchangbdbz

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve ShadowKV
+title: "[BUG]"
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior. The easier it is to reproduce the faster it will get maintainer attention.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Stack trace/logs**
+If applicable, add the stack trace or logs from the time of the error.
+
+**Environment**
+
+**Proposed fix**
+If you have a proposal for how to fix the issue state it here or link to a PR.
+
+**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 ShadowKV
+title: "[ENHANCEMENT]"
+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.
+
+**Proposed implementation**
+If you have a proposed implementation for the feature state it here or link to a PR.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

.github/ISSUE_TEMPLATE/question.md

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+---
+name: Question
+about: Ask a general question about ShadowKV
+title: "[QUESTION]"
+labels: ''
+assignees: ''
+
+---
+
+**Your question**
+Ask a clear and concise question about ShadowKV.