[GSoD 2021] Added issue and pull request templates

.github/ISSUE_TEMPLATE/bug.md

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+---
+name: 🐛 Bug Report
+about: Submit a bug report to help us improve
+---
+
+## 🐛 Bug Report
+
+(A clear and concise description of what the bug is.)
+
+## To Reproduce
+
+(Write your steps here:)
+
+1. Step 1...
+1. Step 2...
+1. Step 3...
+
+## Expected behavior
+
+(Write what you thought would happen.)
+
+## Actual Behavior
+
+(Write what happened. Add screenshots, if applicable.)
+
+## Your Environment
+
+(Environment name, version and operating system.)

.github/ISSUE_TEMPLATE/documentation.md

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+---
+name: 📚 Documentation
+about: Report an issue related to documentation
+---
+
+## 📚 Documentation
+
+(A clear and concise description of what the issue is.)

.github/ISSUE_TEMPLATE/feature.md

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+---
+name: 🚀 Feature
+about: Submit a proposal/request for a new feature
+---
+
+## 🚀 Feature
+
+(A clear and concise description of what the feature is.)

.github/PULL_REQUEST_TEMPLATE.md

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+<!--
+Thank you for sending the PR! We appreciate you spending the time to work on these changes.
+
+Help us understand your motivation by explaining why you decided to make this change.
+
+You can learn more about contributing to Wechaty gRPC here: https://github.com/wechaty/grpc/blob/master/CONTRIBUTING.md
+
+Happy contributing!
+
+-->
+
+#### Checklist
+
+- [ ] Commit Messages follow the [Conventional Commits](https://conventionalcommits.org/) pattern
+  - A feature commit message is prefixed "feat:"
+  - A bugfix commit message is prefixed "fix:"
+- [ ] Tests for the changes have been added
+- [ ] CI has been passed. (GitHub actions all turns green)
+- [ ] CLA has been signed
+
+#### References to other Issues or PRs
+
+<!-- If this pull request fixes an issue, write "Fixes #NNNN" in that exact
+format, e.g. "Fixes #1234" (see
+https://tinyurl.com/auto-closing for more information). Also, please
+write a comment on that issue linking back to this pull request once it is
+open. -->
+
+#### Have you read the [Contributing Guidelines](https://github.com/wechaty/grpc/blob/master/CONTRIBUTING.md)?
+
+#### Brief description of what is fixed or changed
+
+#### Other comments
+
+<!--
+    Don't forget about CHANGELOG!
+
+    Changelog entry format:
+    - [#<PR-id>](<PR-URL>) Wechaty gRPC <Component> ...
+
+    <PR-id> Id of your pull request.
+    <PR-URL> URL of your PR such as https://github.com/wechaty/grpc/pull/<PR-id>
+    <Component> Component affected by your changes such as csharp, go, java, etc.
+-->