Add github pull request template.

.github/pull_request_template.md

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+- [ ] If you are contributing a new feature, is your work based off the develop branch?
+- [ ] If you are contributing a bugfix, is your work based off the fixes branch?
+- [ ] Have you added an explanation of what your changes do and why you'd like us to include them?
+- [ ] Have you successfully run `make test` with your changes locally?
+- [ ] Have you signed the [Eclipse Contributor Agreement](https://www.eclipse.org/legal/ECA.php), using the same email address as you used in your commits?
+- [ ] Do each of your commits have a "Signed-off-by" line, with the correct email address? Use "git commit -s" to generate this line for you.
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