PULL_REQUEST_TEMPLATE

#### What does this PR do?
#### Who is reviewing it? 
(please choose AT LEAST two reviewers that need to approve the PR before it can get merged; if a component team is listed, at least one of its members needs to approve)
#### Choose 2 committers to review/merge the PR.
(please choose ONLY two committers from below, delete the rest)

@andrewkfiedler
@bdeining
@beyelerb
@brendan-hofmann
@clockard
@coyotesqrl
@figliold
@jaymcnallie
@jlcsmith
@kcwire
@lessarderic
@michaelmenousek
@millerw8
@mrmateo
@pklinef
@ricklarsen - Documentation
@rzwiefel
@shaundmorris
@stustison
#### How should this be tested?
#### Any background context you want to provide?
#### What are the relevant tickets?

[CAL-xxx](https://codice.atlassian.net/browse/CAL-xxx)
#### Screenshots (if appropriate)
#### Checklist:
- [ ] Documentation Updated
- [ ] Update / Add Unit Tests
- [ ] Update / Add Integration Tests