Create pull_request_template.md (#177)

* Create pull_request_template.md

Author: typotter

.github/pull_request_template.md

@@ -0,0 +1,17 @@
+_Eppo Internal:_
+
+[//]: #  (Link to the issue corresponding to this chunk of work)
+:tickets: Fixes __issue__
+:scroll: Design Doc: __link if applicable__
+
+## Motivation and Context
+[//]: #  (Why is this change required? What problem does it solve?)
+
+## Description
+[//]: # (Describe your changes in detail)
+
+## How has this been documented?
+[//]: # (Please describe how you documented the developer impact of your changes; link to PRs or issues or explain why no documentation changes are required)
+
+## How has this been tested?
+[//]: # (Please describe in detail how you tested your changes)