Backlight abstraction and other changes (#439)

* redoes matrix pins, abstracts backlight code for B5,6,7

* slimming down keyboard stuff, backlight breathing implemented

* don't call backlight init when no pin

* cleans up user/kb/quantum calls, keyboard files

* fix pvc atomic

* replaces CHANNEL with correct var in breathing

* removes .hexs, updates readmes, updates template

* cleans-up clueboards, readmes to lowercase

* updates readme

1 files changed, 25 insertions, 0 deletions

diff --git a/keyboards/preonic/readme.md b/keyboards/preonic/readme.md
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+Preonic keyboard firmware
+======================
+DIY/Assembled compact ortholinear 50% keyboard by [Ortholinear Keyboards](http://ortholinearkeyboards.com).
+
+## 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/preonic 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 a file in the keymaps folder named `<name>.c` 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.