Update README.md

README.md

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-# attiny-stuff
+# attiny-stuff
+
+This is my repository of C code written for the DigiSpark development board.
+
+It's highly disorganized and written primarily from an experimental point of view. Capabilities tested so far:
+
+1. Ability to allocate arrays of varying sizes (some instability sets in at ~450 bytes due to stack overflow(?))
+2. FP32 arithmetic (purely software based), chip is currently incompatible with FP64 math.
+3. PWM signals to drive a passive buzzer.
+4. Incorporating the V-USB library for communication with a host device over USB/1.1.
+5. Timer, pin change and general interrupts.