Creating pull request template (#385)

Summary:
Having a pull request template should standardize the content that comes through in our community PRs (and our own as well). This should hopefully encourage people to *test* their changes and show us how they did.

Thanks to https://github.com/stevemao/github-issue-templates for the base for this PR template.
Closes #385

Differential Revision: D8611387

Pulled By: JackUrb

fbshipit-source-id: 8e3c2fc0664335d93d1841f6375eed1ca3bdebe5

PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,32 @@
+<!--- Provide a general summary of your changes in the Title above -->
+
+## Description
+<!--- Describe your changes in detail -->
+
+## Motivation and Context
+<!--- Why is this change required? What problem does it solve? -->
+<!--- If it fixes an open issue, please link to the issue here. -->
+
+## How Has This Been Tested?
+<!--- Please describe in detail how you tested your changes. -->
+<!--- Include details of your testing environment, experiments you ran to see how -->
+<!--- your change affects existing areas of the code and their behaviors, etc. -->
+<!--- One method of testing is to run the `demo.py` script from the examples -->
+<!--- both on your branch and a clean branch and ensure that none of the functionality -->
+<!--- appears different. Be sure to install from source when testing. -->
+
+## Screenshots (if appropriate):
+
+## Types of changes
+<!--- What types of changes does your code introduce? Put an `x` in all the boxes that apply: -->
+- [ ] Bug fix (non-breaking change which fixes an issue)
+- [ ] New feature (non-breaking change which adds functionality)
+- [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
+
+## Checklist:
+<!--- Go over all the following points, and put an `x` in all the boxes that apply. -->
+<!--- If you're unsure about any of these, don't hesitate to ask. We're here to help! -->
+- [ ] My code follows the code style of this project.
+- [ ] My change requires a change to the documentation.
+- [ ] I have updated the documentation accordingly.
+- [ ] For JavaScript changes, I have re-generated the minified JavaScript code.