Move templates (#23874)

* Move templates into new .github folder

* Add .github to npmignore

.github/issue_template.md

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+<!-- 🚨 STOP 🚨 𝗦𝗧𝗢𝗣 🚨 𝑺𝑻𝑶𝑷 🚨 -->
+<!--
+Half of all issues filed here are duplicates, answered in the FAQ, or not appropriate for the bug tracker.
+
+Please help us by doing the following steps before logging an issue:
+  * Search: https://github.com/Microsoft/TypeScript/search?type=Issues
+  * Read the CONTRIBUTING guidelines: https://github.com/Microsoft/TypeScript/blob/master/CONTRIBUTING.md
+  * Read the FAQ: https://github.com/Microsoft/TypeScript/wiki/FAQ
+-->
+
+<!-- If you have a QUESTION:
+   THIS IS NOT A FORUM FOR QUESTIONS.
+   Ask questions at http://stackoverflow.com/questions/tagged/typescript
+    or https://gitter.im/Microsoft/TypeScript
+-->
+
+<!-- If you have a SUGGESTION:
+  Most suggestion reports are duplicates, please search extra hard before logging a new suggestion.
+  See https://github.com/Microsoft/TypeScript-wiki/blob/master/Writing-Good-Design-Proposals.md
+-->
+
+<!-- If you have a BUG:
+  Please fill in the *entire* template below.
+-->
+
+<!-- Please try to reproduce the issue with `typescript@next`. It may have already been fixed. -->
+**TypeScript Version:**  2.9.0-dev.201xxxxx
+
+<!-- Search terms you tried before logging this (so others can find this issue more easily) -->
+**Search Terms:** 
+
+**Code**
+
+```ts
+// A *self-contained* demonstration of the problem follows...
+// Test this by running `tsc` on the command-line, rather than through another build tool such as Gulp, Webpack, etc.
+```
+
+**Expected behavior:**
+
+**Actual behavior:**
+
+**Playground Link:** <!-- A link to a TypeScript Playground "Share" link which demonstrates this behavior --> 
+
+**Related Issues:**

.github/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 labeled
+  'Bug' or 'help wanted' 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 #