Create PULL_REQUEST_TEMPLATE.md

Author: wtam2018

.github/PULL_REQUEST_TEMPLATE.md

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+**What type of PR is this?**
+> Uncomment only one ` /kind` line, and delete the rest.
+> For example, `> /kind bug` would simply become: `/kind bug`
+
+> /kind bug
+> /kind cleanup
+> /kind failing-test
+> /kind enhancement
+> /kind documentation
+> /kind code-refactoring
+
+
+**What does this PR do / why we need it**:
+
+**Have you updated the necessary documentation?**
+
+* [ ] Documentation update is required by this PR.
+* [ ] Documentation has been updated.
+
+**Which issue(s) this PR fixes**:
+
+Fixes #?
+
+**How to test changes / Special notes to the reviewer**: