Add default PR template

.github/pull_request_template.md

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+### Requirements for Pull Request
+* Read
+  [CONTRIBUTING.md](https://github.com/wil3/gymfc/blob/master/CONTRIBUTING.md)
+* Open an issue. Any change needs to be discussed before proceeding. Failure to do so may result in the rejection of the pull request.
+* Fill out the template below, any pull request that does not include enough information to be reviewed in a timely manner may be closed at the maintainers' discretion.
+
+### Description of the Change
+
+Closes: #XXX
+
+<!--
+
+We must be able to understand the design of your change from this description. If we can't get a good idea of what the code will be doing from the description here, the pull request may be closed at the maintainers' discretion. Keep in mind that the maintainer reviewing this PR may not be familiar with or have worked with the code here recently, so please walk us through the concepts.
+
+-->
+
+### Verification Process
+<!--
+
+What process did you follow to verify that your change has the desired effects?
+
+- How did you verify that all new functionality works as expected?
+- How did you verify that all changed functionality works as expected?
+- How did you verify that the change has not introduced any regressions?
+
+Describe the actions you performed (commands you ran, etc.), and describe the results you observed.
+
+-->