docs: add new screenshots (#53)

* Add files via upload

Author: dido18

README.md

@@ -7,7 +7,7 @@
 Scratch for Arduino UNO Q is an Arduino App that runs Scratch directly on the board to control physical world (e.g., LEDs, buttons, and Arduino Modulino) with optional AI model integration.
 Accessible from any device via a browser, it makes coding, electronics, and AI hands-on and easy to explore.
 
-![Scratch for Arduion UNO Q](./doc/scratch-unoq.png)
+![Scratch for Arduion UNO Q](./doc/blink.png)
 
 ## Installation
 
@@ -23,6 +23,17 @@ curl -sSL https://raw.githubusercontent.com/dido18/scratch-arduino-app/main/inst
 
 NOTE: the `https` is needed by the `getUserMedia()` method for security reason.
 
+## Screenshots
+
+Add the extensions for Arduino UNO Q.
+![Scratch UNO Q extensions](./doc/extensions.png)
+
+Use the matrix block to control the LED matrix.
+![Scratch Matrix](./doc/matrix.png)
+
+Uue the Modulino blocks to control the Modulino.
+![Scratch Modulino](./doc/modulino.png)
+
 ## Local development
 
 - `task scratch:init`