Readme started.

README.md

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-# iidx_pico
-Pico beatmania IIDX controller
+# Pico IIDX - Beatmania IIDX controller
+
+<img src="doc/main.jpg" width="80%">
+
+Features:
+* It's thin, really thin.
+* Turntable and keyboard are separate.
+* Magnetic connector.
+* 1000Hz polling rate.
+* HID lights, of course!
+* Multiple turntable effects.
+* Many live settings.
+
+<img src="doc/stacked.jpg" width="80%">
+
+<video src="xxx.mp4" controls="controls" width="50%"></video>
+
+Thanks to many respectful guys/companies who made their tools or materials free or open source (KiCad, OpenSCAD, InkScape, Raspberry things).
+
+## Caution
+This is a difficult build. Much more difficult than my previous Pico Popn project: https://github.com/whowechina/popn_pico. Move forward only if you're REALLY interested.  
+I'm still working on this documentation. If you see incomplete things, that's normal.
+
+## HOW TO BUILD
+### Materials
+### Step 1 - Buy
+### Step 2 - Solder
+### Step 3 - Assemble
+### Step 4 - Firmware
+