Update README and add PR template (#160)

* Update README.md
* Add CODEOWNERS
* Add PR template
* Add VS Code .gitignore

.github/pull_request_template.md

@@ -0,0 +1,28 @@
+**TL;DR -** [ A short summary of what this PR does and why ]
+
+JIRA: [JIRA-XXXX](https://openedx.atlassian.net/browse/JIRA-XXXX)
+
+**What changed?**
+
+- [ More in depth breakdown of changes ]
+- [ Peripheral things that got changed ]
+- [ etc... ]
+
+**Developer Checklist**
+- [ ] Test suites passing
+- [ ] Received code-owner approving review
+- [ ] Bumped version number [package.json](../package.json)
+
+**Testing Instructions**
+
+[ How should a reviewer test this PR? ]
+
+**Reviewer Checklist**
+
+Collectively, these should be completed by reviewers of this PR:
+
+- [ ] I've done a visual code review
+- [ ] I've tested the new functionality
+
+
+FYI: @edx/masters-devs-gta