Move templates (microsoft#23874)

* Move templates into new .github folder

* Add .github to npmignore

Author: weswigham

issue_template.md renamed to .github/issue_template.md

@@ -2,12 +2,10 @@ built
 doc
 Gulpfile.ts
 internal
-issue_template.md
 jenkins.sh
 lib/README.md
 lib/enu
 netci.groovy
-pull_request_template.md
 scripts
 src
 tests
@@ -24,3 +22,4 @@ Jakefile.js
 test.config
 package-lock.json
 yarn.lock
+.github/