Add 'archive' tag to violet

Added 'archive' tag to the existing tags list.

Author: dkhamsing

contents.json

@@ -27610,7 +27610,7 @@
       "tags": [
         "flutter",
         "dart",
-        "adult"
+        "adult", "archive"
       ],
       "license": "apache-2.0",
       "date_added": "Nov 9 2021",