Add pearl README, add rask's Pearl layout

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+# Pearl 40%
+
+Pearl 40% is a keyboard designed by Koobaczech. It uses an Atmel
+ATMEGA32A MCU.
+
+## Compiling and flashing
+
+These instructions are for building and flashing your Pearl 40% without
+Bootmapper Client.
+
+### Requirements
+
+#### Windows
+
+(to be written, help needed)
+
+#### Mac
+
+Apart from regular QMK and AVR dependencies you need to install
+`bootloadHID`. You can install it with `homebrew` as follows:
+
+    $ brew install --HEAD https://raw.githubusercontent.com/robertgzr/homebrew-tap/master/bootloadhid.rb
+
+If you don't use `homebrew` you can try following the compiling
+instructions defined below in the Linux section.
+
+#### Linux
+
+For Linux you require all regular QMK dependencies, but make sure you're
+using `gcc-avr` version 4.9 or higher. 4.8 and lower do not contain the
+proper definitions for ATMEGA32A MCUs and QMK will fail while attempting
+to compile a HEX for Pearl 40%.
+
+E.g. you cannot compile Pearl 40% HEX on a regular Ubuntu 14.04 as
+`gcc-avr` version is maxed to 4.8 on it.
+
+Additionally you need an operational `bootloadHID` binary.
+
+You can install `bootloadHID` by taking the following steps:
+
+    $ git clone https://github.com/robertgzr/bootloadHID ~/tmp/bootloadHIDsrc
+    $ cd ~/tmp/bootloadHIDsrc/commandline
+    $ make VENDORID=0x16c0 PRODUCTID=0x05DF # vid and pid for atmega32a
+    $ chmod +x bootloadHID && cp bootloadHID /usr/bin/bootloadHID
+    
+Running `which bootloadHID` should return `/usr/bin/bootloadHID`.
+    
+### Compiling
+
+Enter the QMK root directory and compile a keymap with the following
+command:
+
+    $ make pearl:<keymap>
+    
+where `<keymap>` is a layout directory under the `pearl` directory.
+
+QMK should compile a HEX (called `pearl_<keymap>.hex`) for you, which
+you can flash using `bootloadHID`.
+
+### Flashing
+
+To enable Pearl 40% bootloading mode, unplug the keyboard, then plug it
+in while holding `Esc` at the same time (the top-leftmost switch on the
+PCB, next to the USB connector). Once the board is in bootload mode,
+issue the following command (you might require `sudo` to perform the
+command):
+
+    # assuming we're still in the QMK root dir where you compiled a HEX into
+    $ bootloadHID -r ./pearl_<keymap>.hex
+
+You should see something similar to
+
+    > Page size = <value>
+    > Device size = <value>; <value> remaining
+    > Uploading <value> bytes starting at 0 (0x0)
+    > <value> ... <current value>
+    
+where `<current value>` should be slowly increasing as the HEX is being
+flashed to the board. If there is some warning about `resource busy` it
+should still work OK.
+
+Once done the board underglow should turn red and the new firmware has
+been flashed. If you can't type on the board try plugging it in again
+(without holding any keys to prevent accidentally setting it into
+bootload mode again).