[HUDI-342] add pull request template for hudi project (#1022)

.github/PULL_REQUEST_TEMPLATE.md

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+## *Tips*
+- *Thank you very much for contributing to Apache Hudi.*
+- *Please review https://hudi.apache.org/contributing.html before opening a pull request.*
+
+## What is the purpose of the pull request
+
+*(For example: This pull request adds quick-start document.)*
+
+## Brief change log
+
+*(for example:)*
+  - *Modify AnnotationLocation checkstyle rule in checkstyle.xml*
+
+## Verify this pull request
+
+*(Please pick either of the following options)*
+
+This pull request is a trivial rework / code cleanup without any test coverage.
+
+*(or)*
+
+This pull request is already covered by existing tests, such as *(please describe tests)*.
+
+(or)
+
+This change added tests and can be verified as follows:
+
+*(example:)*
+
+  - *Added integration tests for end-to-end.*
+  - *Added HoodieClientWriteTest to verify the change.*
+  - *Manually verified the change by running a job locally.*
+
+## Committer checklist
+
+ - [ ] Has a corresponding JIRA in PR title & commit
+ 
+ - [ ] Commit message is descriptive of the change
+ 
+ - [ ] CI is green
+
+ - [ ] Necessary doc changes done or have another open PR
+       
+ - [ ] For large changes, please consider breaking it into sub-tasks under an umbrella JIRA.