docs: Add PULL_REQUEST_TEMPLATE.md

docs/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,20 @@
+## Description
+
+<!--- Provide a general summary of your change in the Pull Request title above -->
+<!--- Describe your change in detail here -->
+
+## 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 -->
+
+## Related PRs
+
+<!-- Link this PR to other PRs. Include the relationship to the PR, such as -->
+<!-- "Depends on" or "Required by". -->
+
+## How Has This Been Tested?
+
+<!--- Please describe in detail how you tested your change -->
+<!--- Include details of your testing environment, and the tests you ran to -->
+<!--- see how your change affects other areas of the code, etc -->