docs: restore pull request template

Author: tharropoulos

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,20 @@
+<!--
+  Thanks for submitting a pull request!
+  Please provide enough information so that others can review your pull request.
+-->
+
+**Summary**
+
+<!--
+  Explain the **motivation** for making this change.
+  What existing problem does the pull request solve?
+  Are there any linked issues?
+-->
+
+**Result**
+
+<!--
+  Demonstrate the code is solid.
+  Example: The exact commands you ran and their output,
+  screenshots / videos if the pull request changes UI.
+-->