add readmes

README.md

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 # pico-led-matrix
+
+Tiny modular LED matrix. Idea is to have a matrix of 50x50mm modules:
+
+- LED modules with a 20x20 matrix of 0603 red LEDs.
+- Multiplexer/driver modules at the end of rows and columns
+- Microcontroller (RP2040) board in the corner.
+
+JLCPCB Assembly optimized.
+
+This is an electronics learning experiment, will likely fail. I do not know what I'm doing

pcb/DemoBoard1/README.md

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+# Demo Baord 1
+
+Learning how to use shift registers, darlington arrays, and mosfets. I don't know what I'm doing.
+
+Demo board containing LED Matrix module + some of the above components for hands-on experimentation.
+
+Ordered and manufactured 2024-03-05

pcb/LedArray/README.md

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+# LED Matrix module
+
+50x50mm module with 20x20 LED matrix

pcb/LedArrayMux/README.md

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+# LED Multiplexer - WIP
+
+50x50mm module for driving rows and columns of LED Matrix modules