Add pull request template

.github/PULL_REQUEST_TEMPLATE

+<!---
+Please provide answers in the spaces below each prompt, where applicable.
+Not every PR requires responses for each prompt.
+Use your discretion.
+-->
+#### Name of feature:
+
+#### Pain or issue this feature alleviates:
+
+#### Why is this important to the project (if not answered above):
+
+#### Is there documentation on how to use this feature? If so, where?
+
+#### In what environments or workflows is this feature supported?
+
+#### In what environments or workflows is this feature explicitly NOT supported (if any)?
+
+#### Supporting links/other PRs/issues:
+
+💔Thank you!