Extension: add Kittenbot miniLFR (#4433)

docs/extensions.md

@@ -461,6 +461,10 @@ Check out [the accessories pages on microbit.org](https://microbit.org/buy/acces
 
 ```codecard
 [{
+  "name": "Kittenbot miniLFR",
+  "url":"/pkg/KittenBot/pxt-minilfr",
+  "cardType": "package"
+}, {
   "name": "Cytron ZOOM:BIT",
   "url":"/pkg/CytronTechnologies/pxt-zoombit",
   "cardType": "package"

targetconfig.json

@@ -235,7 +235,8 @@
             "SGBotic/pxt-SGBotic-Ultimate-SR04-RGB",
             "CytronTechnologies/pxt-zoombit",
             "Kodely-io/dot",
-            "climate-action-kits/pxt-climate-action-kit-energy"
+            "climate-action-kits/pxt-climate-action-kit-energy",
+            "KittenBot/pxt-minilfr"
         ],
         "preferredRepos": [
             "Microsoft/pxt-neopixel",