add: Issue template chooser

Author: sksat

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,8 @@
+blank_issues_enabled: true
+contact_links:
+  - name: GitHub Community Support
+    url: https://github.community/
+    about: Please ask and answer questions here.
+  - name: GitHub Security Bug Bounty
+    url: https://bounty.github.com/
+    about: Please report security vulnerabilities here.