Add Pull Request Template (#4298)

* add: pull request template

* Update pull_request_template.md

* add: squash and merge clause

* add: "explain why" reaffirm for breaking change

.github/pull_request_template.md

@@ -0,0 +1,34 @@
+<!--- Add a pull request title above in this format -->
+<!--- real example: 'AE-0001 | Applying MVVM Model' -->
+<!--- 'AE-JiraIssueNumber | JiraIssueTitle' (JiraIssueNumber can be removed if not available) -->
+
+## Description of what I changed
+<!--- Please include a summary of the change, relevant motivation and context -->
+<!--- It can simply be your commit message, which you must have -->
+
+
+## Issue I worked on
+<!--- Please add the issue number at the end -->
+<!--- Delete section if an issue is not available -->
+JIRA Issue: https://navihq.atlassian.net/browse/AE-####
+
+## Type of change I made
+<!--- Please delete options that are not relevant -->
+- [ ] Bug fix (non-breaking change which fixes an issue)
+- [ ] New feature (non-breaking change which adds functionality)
+- [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected, explain why)
+- [ ] Refactoring / Maintenance (non-breaking change to keep the project healthy)
+
+## QA Requirement for my changes
+<!--- Please delete options that are not relevant -->
+- [ ] QA is required for this change (QA Owner: @github-username)
+- [ ] QA is not required for this change
+
+## Checklist: I completed these to help reviewers :)
+<!--- Put an `x` in the box if you did the task -->
+- [ ] I am able to build the project locally with my changes
+- [ ] My changes generate no new warnings
+- [ ] My code follows the style guidelines of this project & spotless check passes
+- [ ] I have performed a self-review of my own code
+- [ ] I have made corresponding changes to the documentation
+- [ ] I understand that **'Squash and merge'** is the preferred merge