adds pull request template

Author: abooker

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,23 @@
+## What does this PR do?
+
+Summary of update
+
+<details>
+  <summary>Update details</summary>
+
+  * shiny new stuffs
+</details>
+
+## How should this update be tested?
+
+<details>
+  <summary>Updated unittests or New unit tests added</summary>
+
+  * nosetests tests/test_new_tests.py
+</details>
+
+<details>
+  <summary>New feature test example</summary>
+
+  * example library usage
+</details>