Add template for pull request

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,19 @@
+Thank you for your contribution to the MindAudio repo.
+Before submitting this PR, please make sure:
+
+- [ ] You have read the [Contributing Guidelines on pull requests](https://github.com/mindspore-lab/mindaudio/blob/main/CONTRIBUTING.md)
+- [ ] Your code builds clean without any errors or warnings
+- [ ] You are using approved terminology
+- [ ] You have added unit tests
+
+## Motivation
+
+(Write your motivation for proposed changes here.)
+
+## Test Plan
+
+(How should this PR be tested? Do you require special setup to run the test or repro the fixed bug?)
+
+## Related Issues and PRs
+
+(Is this PR part of a group of changes? Link the other relevant PRs and Issues here. Use https://help.github.com/en/articles/closing-issues-using-keywords for help on GitHub syntax)