Add issue & pull request templates (#331)

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Something isn't working as expected.
+title: ''
+labels: type/bug
+assignees: ''
+
+---
+
+## Bug Report
+
+Please answer these questions before submitting your issue. Thanks!
+
+1. What did you do?
+If possible, provide a recipe for reproducing the error.
+
+2. What did you expect to see?
+
+3. What did you see instead?
+
+4. What version of Pegasus are you using?

.github/ISSUE_TEMPLATE/general_question.md

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+---
+name: "\U0001F914 General Question"
+about: General question that isn't answered in docs
+
+---
+
+## General Question
+
+Before asking a question, make sure you have:
+
+- Searched open and closed [GitHub issues](https://github.com/XiaoMi/pegasus/issues)
+- Read the documentation:
+  - [Pegasus Doc](https://pegasus-kv.github.io)

.github/pull_request_template.md

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+### What problem does this PR solve? <!--add issue link with summary if exists-->
+
+
+### What is changed and how it works?
+
+
+### Check List <!--REMOVE the items that are not applicable-->
+
+Tests <!-- At least one of them must be included. -->
+
+- Unit test
+- Integration test
+- Manual test (add detailed scripts or steps below)
+- No code
+
+Code changes
+
+- Has exported function/method change
+- Has exported variable/fields change
+- Has interface methods change
+- Has persistent data change
+
+Side effects
+
+- Possible performance regression
+- Increased code complexity
+- Breaking backward compatibility
+
+Related changes
+
+- Need to cherry-pick to the release branch
+- Need to update the documentation
+- Need to be included in the release note