adds PR template (#330)

Author: JBAhire

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,25 @@
+## Description
+Please include a summary of the change, motivation and context.
+
+<!--
+- **on a feature**: describe the feature and how this change fits in it, e.g. this PR makes kafka message.max.bytes configurable to better support batching
+- **on a refactor**: describe why this is better than previous situation e.g. this PR changes logic for retry on healthchecks to avoid false positives
+- **on a bugfix**: link relevant information about the bug (github issue or slack thread) and how this change solves it e.g. this change fixes #99999 by adding a lock on read/write to avoid data races.
+-->
+
+
+### Testing
+Please describe the tests that you ran to verify your changes. Please summarize what did you test and what needs to be tested e.g. deployed and tested helm chart locally. 
+
+### Checklist:
+- [ ] My changes generate no new warnings
+- [ ] I have added tests that prove my fix is effective or that my feature works
+- [ ] Any dependent changes have been merged and published in downstream modules
+
+### Documentation
+Make sure that you have documented corresponding changes in this repository or [hypertrace docs repo](https://github.com/hypertrace/hypertrace-docs-website) if required.
+
+<!--
+Include __important__ links regarding the implementation of this PR.
+This usually includes and RFC or an aggregation of issues and/or individual conversations that helped put this solution together. This helps ensure there is a good aggregation of resources regarding the implementation.
+-->