chore: added pull request template

Author: hurali97

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,18 @@
+## Description
+
+<!--
+  Thank you for submitting a PR!
+
+  Help us understand more of your work - you can explain what you did, post a
+  link to an issue, screenshots etc. Anything helps!
+-->
+
+## Test Plan
+
+<!--
+    Help us test your work (**REQUIRED**).
+
+    If you changed the code, please provide us with instructions of how we can
+    try it out ourselves, so we can confirm it's working. You can also post
+    screenshots/gifs/videos.
+-->