Add ReadMe

ReadMe.md

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+# Flipper Video Game Module
+
+## Building
+
+Requirements: 
+
+- arm-none-eabi-gcc
+- CMake
+
+## Getting Source Code
+
+	git clone --recursive https://github.com/flipperdevices/video-game-module.git
+
+Make sure that all git sub-modules was recursively cloned.
+
+## Compiling
+
+	# In project folder
+	( cd build && cmake .. )
+
+Compiled firmware can be found in `app` folder.
+
+## Flashing
+
+- Press and hold boot button, plug VGM into your computer USB
+- Copy `vgm-fw-*.uf2` from `build/app` folder to newly appeared drive