Create PULL_REQUEST_TEMPLATE.md (#211)

Signed-off-by: Yuwei Ba <[email protected]>

.github/PULL_REQUEST_TEMPLATE.md

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+<!--
+First of all, thank you for your contribution! 😄
+For requesting to pull a new feature or bugfix, please send it from a feature/bugfix branch based on the `master` branch.
+Before submitting your pull request, please make sure the checklist below is confirmed.
+Your pull requests will be merged after one of the collaborators approve.
+Thank you!
+-->
+
+### 🤔 This is a ...
+
+- [ ] New feature
+- [ ] Bug fix
+- [ ] Performance optimization
+- [ ] Enhancement feature
+- [ ] Refactoring
+- [ ] Code style optimization
+- [ ] Test Case
+- [ ] Branch merge
+- [ ] Workflow
+- [ ] Other (about what?)
+
+### 🔗 Related issue link
+
+<!--
+1. Put the related issue or discussion links here.
+2. close #xxxx or fix #xxxx for instance.
+-->
+
+### 💡 Background and solution
+
+<!--
+1. Describe the problem and the scenario.
+2. Provider a sample config if you can.
+3. How to fix the problem, and list the final implementation and usage sample if that is a new feature.
+-->
+
+### 📝 Changelog
+
+<!--
+Describe changes from the user side, and list all potential break changes or other risks.
+--->
+
+
+### ☑️ Self-Check before Merge
+
+⚠️ Please check all items below before requesting a reviewing. ⚠️
+
+- [ ] Doc is updated/provided or not needed
+- [ ] Changelog is provided or not needed