Merge pull request #7120 from RyanCavanaugh/addTemplates

Add issue and PR templates

issue_template.md

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+<!--
+Thank you for contributing to TypeScript! Please review this checklist
+       before submitting your issue.
+[ ] Many common issues and suggestions are addressed in the FAQ
+     https://github.com/Microsoft/TypeScript/wiki/FAQ
+[ ] Search for duplicates before logging new issues
+    https://github.com/Microsoft/TypeScript/issues?utf8=%E2%9C%93&q=is%3Aissue
+[ ] Questions are best asked and answered at Stack Overflow
+    http://stackoverflow.com/questions/tagged/typescript
+
+For bug reports, please include the information below.
+__________________________________________________________ -->
+
+**TypeScript Version:** 
+
+**Code**
+```ts
+// A self-contained demonstration of the problem follows...
+
+```
+
+**Expected behavior:** 
+**Actual behavior:** 

pull_request_template.md

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+<!--
+Thank you for submitting a pull request!
+
+Here's a checklist you might find useful.
+[ ] There is an associated issue that is labelled
+  'Bug' or 'Accepting PRs' or is in the Community milestone
+[ ] Code is up-to-date with the `master` branch
+[ ] You've successfully run `jake runtests` locally
+[ ] You've signed the CLA
+[ ] There are new or updated unit tests validating the change
+
+Refer to CONTRIBUTING.MD for more details.
+  https://github.com/Microsoft/TypeScript/blob/master/CONTRIBUTING.md
+-->
+
+**Fixes issue:** #