Move fw into direct subdir

fw/README.md

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+# HID implementation for IBM-dials-retrofit
+
+Works, currently hardcoded:
+
+ - Dial 1: Volume Up/Down
+ - Dial 2: nothing
+ - Dial 3: KiCAD switch layer (v)
+ - Dial 4: KiCAD rotate part (r|R)
+ - Dial 5: KiCAD change grid settings (n|N)
+ - Dial 6: nothing
+ - Dial 7: KiCAD change track width (w|W)
+ - Dial 8: KiCAD zoom (+|-)
+
+ Build with `make`
+
+ Flash with `dfu-util -a 0 -s 0x08000000:leave -D build/hid-dials.bin`
+
+ Todo:
+
+ - [ ] Add filesystem and csv alike config files