lightning/.github/PULL_REQUEST_TEMPLATE.md

## What does this PR do?

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Fixes # (issue) <- this [links related issue to this PR](https://docs.github.com/en/free-pro-team@latest/github/managing-your-work-on-github/linking-a-pull-request-to-an-issue#linking-a-pull-request-to-an-issue-using-a-keyword)

## Before submitting
- [ ] Was this discussed/approved via a GitHub issue? (not for typos and docs)
- [ ] Did you read the [contributor guideline](https://github.com/PyTorchLightning/pytorch-lightning/blob/master/.github/CONTRIBUTING.md), **Pull Request** section?
- [ ] Did you make sure your PR does only one thing, instead of bundling different changes together?
- [ ] Did you make sure to update the documentation with your changes? (if necessary)
- [ ] Did you write any new necessary tests? (not for typos and docs)
- [ ] Did you verify new and existing tests pass locally with your changes?
- [ ] Did you update the [CHANGELOG](https://github.com/PyTorchLightning/pytorch-lightning/blob/master/CHANGELOG.md)? (not for typos, docs, test updates, or internal minor changes/refactorings)

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## PR review
Anyone in the community is free to review the PR once the tests have passed.
Before you start reviewing make sure you have read [Review guidelines](https://github.com/PyTorchLightning/pytorch-lightning/wiki/Review-guidelines). In short, see the following bullet-list:

 - [ ] Is this pull request ready for review? (if not, please submit in draft mode)
 - [ ] Check that all items from **Before submitting** are resolved
 - [ ] Make sure the title is self-explanatory and the description concisely explains the PR
 - [ ] Add labels and milestones (and optionally projects) to the PR so it can be classified
 - [ ] **Check that target branch and milestone match!**


## Did you have fun?
Make sure you had fun coding 🙃