feat: multimatrix example

examples/multimatrix/README.md

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+# Multi-Matrix
+
+This example combines different capabilities:
+- Spore base stack
+- use PixelStreamController in Matrix mode 16x16
+- DFRobotDFPlayerMini audio playback
+- analog potentiometer to controll audio volume
+- API and web interface to control the audio player (start, stop, pause, next / previous track, volume)
+
+## MCU
+- Wemos D1 Mini
+
+## Pin Configuration
+```
+#define MP3PLAYER_PIN_RX D3
+#define MP3PLAYER_PIN_TX D4
+#define MATRIX_PIN D2 
+#define POTI_PIN A0
+```