Extensions: Add RBTFT1-8 (#4282)

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

docs/extensions.md

@@ -62,6 +62,10 @@ Check out [the accessories pages on microbit.org](https://microbit.org/buy/acces
 
 ```codecard
 [{
+    "name": "Joy-IT RB-TFT1.8",
+    "url": "/pkg/joy-it/pxt-RB-TFT1.8",
+    "cardType": "package"
+}, {
     "name": "Kitronik 128x64 Display",
     "url": "/pkg/KitronikLtd/pxt-kitronik-128x64Display",
     "cardType": "package"

targetconfig.json

@@ -210,6 +210,7 @@
             "joy-it/SEN-MPU6050",
             "gomakekit/Hoverbit_V2",
             "Matrix-Robotics/pxt-MatrixMicro",
+            "joy-it/pxt-RB-TFT1.8",
             "CytronTechnologies/pxt-esp8266",
             "elecfreaks/pxt-Dronebit",
             "elecfreaks/pxt-PlanetX-AI",