Extensions: add Kitronik clip dtector (#2576)

Co-authored-by: Abhijith Chatra <abchatra@microsoft.com>

docs/extensions.md

@@ -459,6 +459,10 @@ Check out [microbit.org](http://microbit.org/resellers/) for more information on
     "name": "HTS221 Humidity and temperature",
     "url": "/pkg/makecode-extensions/HTS221",
     "cardType": "package"
+}, {
+    "name": "Kitronik clip detector",
+    "url": "/pkg/KitronikLtd/pxt-kitronik-clip-detector",
+    "cardType": "package"
 }]
 ```
 

targetconfig.json

@@ -162,6 +162,7 @@
             "alsrobot-microbit-makecode-packages/MiniCruise",
             "4tronix/ServoBit",
             "DFRobot/pxt-maqueen",
+            "KitronikLtd/pxt-kitronik-clip-detector",
             "DFRobot/pxt-DFRobot-NaturalScience"
         ],
         "preferredRepos": [