Adding missed dfrobot (#1527)

docs/extensions.md

@@ -136,6 +136,15 @@ Check out [microbit.org](http://microbit.org/resellers/) for more information on
 }]
 ```
 
+## Internet of Things
+```codecard
+[{
+  "name": "DF Robot Obloq",
+  "url":"/pkg/DFRobot/pxt-Obloq",
+  "cardType": "package"
+}]
+```
+
 ## Other
 
 ```codecard

targetconfig.json

@@ -30,6 +30,7 @@
             "pimoroni/pxt-envirobit",
             "Annikken/pxt-Andee",
             "1010Technologies/pxt-makerbit",
+            "DFRobot/pxt-Obloq",
             "pimoroni/pxt-automationbit",
             "k8robotics/pxt-k8",
             "dexterind/pxt-giggle",