Add 'archive' tag to Technex (#2081)

Author: dkhamsing

contents.json

@@ -25273,7 +25273,7 @@
         "event"
       ],
       "tags": [
-        "swift"
+        "swift", "archive"
       ],
       "screenshots": [
         "https://github.com/jogendra/technex-ios/raw/master/Technex18/gifs/gif-technex-ios-1.gif"