add simple README

README.md

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+![demo gif](docs/demo.gif)
+
+This is a hat for the 40pin GPIO headered Raspberry PIs that exposes the RGB LCD interface
+in such a way to make it usable with a (albait very specific) lcd screen with touch screen.
+
+Touch screen support is implemented with the AR1100 over a USB cable, which must be plugged to the RPI seperatly. 
+
+For the Backlight a small constant LED driver is on board as well, which can be dimmed by 
+using a the hardware PWM1 with GPIO19.
+
+