docs:add PULL_REQUEST_TEMPLATE.md

.github/PULL_REQUEST_TEMPLATE.md

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+## PR Type
+<!--
+Bugfix.
+Feature.
+Code style update (formatting, local variables).
+Refactoring (no functional changes, no api changes).
+Documentation content changes.
+Other... Please describe:
+ -->
+
+## Describe what this PR does for and how you did.
+
+
+## Does this PR be associated with issue? If so, please adding the issue link below.
+
+
+## Note
+
+
+### Checklist
+- [ ] Code compiles correctly
+- [ ] Create at least one junit test if possible
+- [ ] All tests passing
+- [ ] Extend documentation if necessary
+- [ ] Add myself / the copyright holder to the AUTHORS file