galaxy/pull_request_template.md

## What did you do? 
- [describe the proposed changes]
- 


## Why did you make this change?
(Cite Issue number OR provide rationalization of changes if no issue exists)
(If fixing a bug, please add any relevant error or traceback)


## How to test the changes? 
(select the most appropriate option; if the latter, provide steps for testing below)
- [ ] I've included appropriate [automated tests](https://docs.galaxyproject.org/en/latest/dev/writing_tests.html).
- [ ] This is a refactoring of components with existing test coverage.
- [ ] Instructions for manual testing are as follows:
  1. [add testing steps and prerequisites here if you didn't write automated tests covering all your changes]

## For UI Components
- [ ] I've included a screenshot of the changes