Quickpin initial support

docs/quickpin.md

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+# Quickpin
+
+Quickpin helps devs quickly translate pinouts between boards of similar pinouts.
+This lets you write a single `kb.py` that can be swapped between
+microcontrollers with only a single line change and less mistakes. 
+
+## Supported footprints/boards
+
+- Pro micro footprint
+  - Sparkfun Pro micro RP2040
+  - Boardsource Blok
+  - Nice!nano
+
+## Example
+
+In this example, we are converting a Boardsource 3x4 from a hard pinned
+nice!nano to a controller agnostic pinout.
+
+```python
+row_pins = (board.P1_15, board.P0_02, board.P0_29)
+col_pins = (board.P0_09, board.P0_10, board.P1_11, board.P1_13)
+```
+
+Converts to the following. Notice that `nice_nano` can be subbed for
+`boardsource_blok` or `sparkfun_promicro_rp2040`, or any other board sharing
+this pinout.
+
+```python
+from kmk.quickpin.pro_micro.nice_nano import pinout as pins
+
+row_pins = (pins[16], pins[17], pins[18])
+col_pins = (pins[12], pins[13], pins[14], pins[15])
+```
+
+## Porting from AVR pro micro
+
+An additional added convenience for translating from other firmwares with AVR
+pro micros has also been added to speed up porting.
+
+```python
+from kmk.quickpin.pro_micro.nice_nano import pinout as pins
+from kmk.quickpin.pro_Micro.avr_promicro import avr
+
+row_pins = (
+    pins[avr['F7']],
+    pins[avr['F6']],
+    pins[avr['F5']],
+)
+col_pins = (
+    pins[avr['B6']],
+    pins[avr['B2']],
+    pins[avr['B3']],
+    pins[avr['B1']],
+)
+```
+
+
+## Adding boards to quickpin support
+
+Quickpin format is simply a list of pins in order of all through hole pins,
+going anticlockwise starting at the top left. The orientation should be with the
+chips facing toward you, with USB facing the top. If this isn't appliable, or
+otherwise is not true, it should be stated in a comment in the file. Any pin
+that is not addressable in software should be left as `None` to fill the space,
+and align pins correctly for all boards. All boards should be stored in 
+`kmk/quickpin/<footprint>/boardname.py`
+
+Pro Micro RP2040 shown as an example
+```python
+import board
+
+pinout = [
+    board.TX,
+    board.RX,
+    None,  # GND
+    None,  # GND
+    board.D2,
+    board.D3,
+    board.D4,
+    board.D5,
+    board.D6,
+    board.D7,
+    board.D8,
+    board.D9,
+    board.D21,
+    board.MOSI,
+    board.MISO,
+    board.SCK,
+    board.D26,
+    board.D27,
+    board.D28,
+    board.D29,
+    None,  # 3.3v
+    None,  # RST
+    None,  # GND
+    None,  # RAW
+]
+
+```