first attempt at documentation for the amj60 board

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+AMJ60 keyboard firmware
+======================
+DIY/Assembled compact 60% keyboard.
+
+## Quantum MK Firmware
+
+For the full Quantum feature list, see [the parent readme.md](/readme.md).
+
+## Building
+
+Download or clone the whole firmware and navigate to the keyboards/amj60
+folder. Once your dev env is setup, you'll be able to type `make` to generate
+your .hex - you can then use `make dfu` to program your PCB once you hit the
+reset button. 
+
+Depending on which keymap you would like to use, you will have to compile
+slightly differently.
+
+### Default
+To build with the default keymap, simply run `make`.
+
+### Other Keymaps
+Several version of keymap are available in advance but you are recommended to
+define your favorite layout yourself. To define your own keymap create file
+named `<name>.c` in the keymaps folder, and see keymap document (you can find
+in top readme.md) and existent keymap files.
+
+To build the firmware binary hex file with a keymap just do `make` with
+`KEYMAP` option like:
+``
+$ make KEYMAP=[default|jack|<name>]
+``
+Keymaps follow the format **__\<name\>.c__** and are stored in the `keymaps`
+folder.
+
+## Variations
+KEYMAP macros for the following layouts are available:
+
+* default, for all the available, possible keys
+* ANSI, for 60% ANSI keyboard
+* ISO
+* ISO w/ split right shift key
+* HHKB
+
+Remark: all but "ISO w/ split tight shift key" are untested and were done to the best of my knowledge.
+
+### Original tmk firmware
+The original firmware that was used to port to qmk can be found [here](https://github.com/AMJKeyboard/AMJ60).
+
+## Further information
+Since information and documentation for this board are sparse, (at least for non-chinese speaking ppl) here is everything that could be found
+
+* [geekhack discussion](https://geekhack.org/index.php?topic=53070.0)
+* [chinese discussion](https://www.v2ex.com/t/161887)
+* Board has [dedicated pinouts](https://i.imgur.com/D0sWhyh.jpg?1) for a bluetooth module
+* has pins for external power [picture](https://i.imgur.com/00VrtIp.jpg?1).
+* most information comes from [reddit](https://www.reddit.com/r/MechanicalKeyboards/comments/32oonr/gh60_pcb_for_your_custom_keyboard/)