Create pull_request_template.md

Initial pull request template.  We can change as needed based on feedback.

Author: Erin Driggers

.github/pull_request_template.md

@@ -0,0 +1,18 @@
+<!--- 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. -->
+
+## Dependencies
+<!--- If this fix is dependent on code in other repos to be deployed, list that here. -->
+
+## How Has This Been Tested?
+<!--- Please describe in detail how you tested your changes. -->
+<!--- Include details of your testing environment, and the tests you ran to -->
+<!--- see how your change affects other areas of the code, etc. -->
+
+## Screenshots (if appropriate):