updated readme

Author: rjtokenring

src/arduino/app_bricks/sound_generator/README.md

@@ -1,6 +1,14 @@
 # Sound Generator Brick
 
-Play sounds and melodies 
+Sound Generator is a lightweight and expressive audio generation brick that lets you create, manipulate, and play sounds programmatically.
+You can write musical notes, generate tones, and compose melodies — all while shaping the sound through custom waveforms and effects.
+
+Features:
+* *Generate tones and melodies from notes or frequencies.
+* Choose your waveform — sine, square, triangle, sawtooth.
+* Add sound effects such as chorus, overdrive, delay, vibrato, or distortion.
+* Compose procedural music directly from code.
+* Real-time playback over speaker
 
 ## Code example and usage