Add Issue and Pull request templates

.github/ISSUE_TEMPLATE.md

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+<!--
+  PLEASE DON'T DELETE THIS TEMPLATE UNTIL YOU HAVE READ THE FIRST SECTION.
+-->
+
+### Is this a bug report?
+
+(write your answer here)
+
+<!--
+  If you answered "Yes":
+
+    We expect that it will take you about 10-30 minutes to produce a high-quality bug report.
+    While this may seem like a lot, putting care into issues helps us fix them faster.
+    For bug reports, it is REQUIRED to fill the rest of this template, or the issue will be closed.
+
+  If you answered "No":
+
+    We use GitHub Issues exclusively for tracking bugs in Docusaurus. If you're looking for help,
+    the Docusaurus Twitter account, @docusaurus, can be used for help.
+
+  Now scroll below!
+-->
+
+### Have you read the [Contributing Guidelines](https://github.com/facebook/Docusaurus/blob/master/CONTRIBUTING.md)?
+
+(Write your answer here.)
+
+### Environment
+
+(OS, Node, npm, yarn)
+
+### Steps to Reproduce
+
+<!--
+  How would you describe your issue to someone who doesn’t know you or your project?
+  Try to write a sequence of steps that anybody can repeat to see the issue.
+  Be specific! If the bug cannot be reproduced, your issue may be closed.
+-->
+
+(Write your steps here:)
+
+1.
+2.
+3.
+
+### Expected Behavior
+
+<!--
+  How did you expect your project to behave?
+  It’s fine if you’re not sure your understanding is correct.
+  Just write down what you thought would happen.
+-->
+
+(Write what you thought would happen.)
+
+### Actual Behavior
+
+<!--
+  Did something go wrong?
+  Is something broken, or not behaving as you expected?
+  Describe this section in detail, and attach screenshots if possible.
+  Don't just say "it doesn't work"!
+-->
+
+(Write what happened. Add screenshots, if applicable.)
+
+### Reproducible Demo
+
+(Paste the link to an example project and exact instructions to reproduce the issue.)
+
+<!--
+  What happens if you skip this step?
+
+  Someone will read your bug report, and maybe will be able to help you,
+  but it’s unlikely that it will get much attention from the team. Eventually,
+  the issue will likely get closed in favor of issues that have reproducible demos.
+
+  Please remember that:
+
+    * Issues without reproducible demos have a very low priority.
+    * The person fixing the bug would have to do that anyway. Please be respectful of their time.
+    * You might figure out the issues yourself as you work on extracting it.
+
+  Thanks for helping us help you!
+-->

.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 Docusaurus here: https://github.com/facebook/Docusaurus/blob/master/CONTRIBUTING.md
+
+Happy contributing!
+
+-->
+
+## Motivation
+
+(Write your motivation here.)
+
+## Test Plan
+
+(Write your test plan here. If you changed any code, please provide us with clear instructions on how you verified your changes work. Bonus points for screenshots and videos!)
+
+## Related PRs
+
+(If this PR adds or changes functionality, please take some time to update the docs at https://github.com/facebook/docusaurus, and link to your PR here.)