[Keyboard] Add Commodore Amiga 1200 Membrane Converter (#13705)

Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: Ryan <fauxpark@gmail.com>

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+# Amiga 1200 Keyboard Converter
+
+Modification of the Model-M 101 membrane adapter (converter/modelm101) to work with Amiga 1200 keyboard (and possibly Amiga 500/600 too). It would be very convenient to manufacture a small PCB adapter to make easier the task of connecting the keyboard membrane and the Teensy 2.0++ board.
+
+This adapter is meant to allow using the original Amiga keyboard as a USB input device, either with a desktop PC or a R-Pi/FPGA board hosted inside the Amiga case.
+
+Files have been modified in accordance to fit Amiga keyboard layout and features. A second layer has been implemented (momentary toggle "Help" key) to access unexistent keys (like F11 and F12). This is a work in progress.
+
+
+Pins of the Teensy board you should use by default:
+```  
+Columns: 1  2  3  4  5  6  7  8  9  10 11 12 13 14 15 16  
+Pins:    D2 D3 D4 D5 D6 D7 E0 E1 C0 C1 C2 C3 C4 C5 C6 C7 
+--------------------------------------------------------  
+Rows: 1  2  3  4  5  6  7  8  
+Pins: F0 F1 F2 F3 F4 F5 F6 F7  
+--------------------------------------------------------  
+Status LEDs: CapsLock +5V   
+Pins:        B6       5V    
+```  
+
+Please note that some versions of Model M have LED connected with a ribbon cable, and not with separate wires.  
+
+* Keyboard Maintainer: [8bits4ever](https://github.com/8bits4ever)
+* Hardware Supported: Teensy 2.0++ board by PJRC
+* Hardware Availability: https://www.pjrc.com/store/teensypp.html
+
+For first time flashing use the reset button on the Teensy board enter in bootloader mode. Once the board is flashed you can use "HELP"+"R" on the Amiga keyboard for the same purpose.  
+
+Make example for this keyboard (after setting up your build environment):
+
+    make converter/a1200:default
+
+See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).