add pull request template (#4)

By submitting this pull request, I confirm that my contribution is made
under the terms of the Apache 2.0 license.

### Description
Adding a pull request template.

Author: bchampp

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,24 @@
+By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
+
+### Issue Link, if available
+
+### Description
+
+### Demo/Screenshots
+
+### Checklist
+
+- [] I have filled out every section of the PR template
+- [] I have thoroughly tested this change
+
+
+### Testing
+
+#### Unit Tests
+Have unit tests been written for these changes?
+
+#### Integration Tests
+Have integration tests been written for these changes?
+
+#### Examples
+Has a new example been added for the change? (if applicable)