Initial .github/PULL_REQUEST_TEMPLATE.md commit

Author: microsoftopensource

.github/PULL_REQUEST_TEMPLATE.md

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+## Purpose
+<!-- Describe the intention of the changes being proposed. What problem does it solve or functionality does it add? -->
+* ...
+
+## Does this introduce a breaking change?
+<!-- Mark one with an "x". -->
+```
+[ ] Yes
+[ ] No
+```
+
+## Pull Request Type
+What kind of change does this Pull Request introduce?
+
+<!-- Please check the one that applies to this PR using "x". -->
+```
+[ ] Bugfix
+[ ] Feature
+[ ] Code style update (formatting, local variables)
+[ ] Refactoring (no functional changes, no api changes)
+[ ] Documentation content changes
+[ ] Other... Please describe:
+```
+
+## How to Test
+*  Get the code
+
+```
+git clone [repo-address]
+cd [repo-name]
+git checkout [branch-name]
+npm install
+```
+
+* Test the code
+<!-- Add steps to run the tests suite and/or manually test -->
+```
+```
+
+## What to Check
+Verify that the following are valid
+* ...
+
+## Other Information
+<!-- Add any other helpful information that may be needed here. -->