Add PULL_REQUEST_TEMPLATE.md

.github/PULL_REQUEST_TEMPLATE.md

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+## What did you implement:
+
+Closes #XXXXX
+
+## How did you implement it:
+
+
+## How can we verify it:
+
+
+## Todos:
+You don't have to satisfy all of the following.
+
+- [ ] Write tests
+- [ ] Write documentation
+- [ ] Check that there aren't other open pull requests for the same issue/feature
+- [ ] Format your source code by `make fmt`
+- [ ] Pass the test by `make test`
+- [ ] Provide verification config / commands
+- [ ] Enable "Allow edits from maintainers" for this PR
+- [ ] Update the messages below
+
+***Is this ready for review?:*** NO  
+***Is it a breaking change?:*** NO