Create config.yml

Redirect new issues to the lit/lit monorepo

Author: justinfagnani

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,5 @@
+blank_issues_enabled: false
+contact_links:
+  - name: File Issue
+    url: https://github.com/lit/lit/issues/new/choose
+    about: Please file new issues in the lit/lit monorepo