Merge pull request #238 from kbjunky/master

added ADNS9800 and mouse keys/mouse buttons/mouse wheel support

docs/adns9800.md

@@ -0,0 +1,18 @@
+# ADNS9800
+Add this module for controlling ADNS9800 optical sensor.
+```python
+from kmk.modules.adns9800 import ADNS9800
+keyboard.modules.append(ADNS9800(cs=board.GP0, sclk=board.GP2, miso=board.GP4, mosi=board.GP3, invert_y=True))
+```
+
+Firmware for this sensor has to be obtained separately and placed in kmk\modules\adns9800_firmware.py
+```python
+firmware = (
+    b'\x03'
+    b'\xa6'
+    ...
+)
+```
+
+## Constructor parameters
+ADNS9800(cs=*cs_pin*, sclk=*clock_pin*, miso=*miso_pin*, mosi=*mosi_pin*, invert_x=*False*, invert_y=*False*)

docs/mouse_keys.md

@@ -0,0 +1,20 @@
+# Mouse keys
+To enable mouse cursor and/or mouse buttons control from the keyboard add this module to list:
+```python
+from kmk.modules.mouse_keys import MouseKeys
+keyboard.modules.append(MouseKeys())
+```
+
+# Keycodes
+
+|Keycode        | Description               |
+|---------------|---------------------------|
+|MB_LMB         |Left mouse button          |
+|MB_RMB         |Right mouse button         |
+|MB_MMB         |Middle mouse button        |
+|MW_UP          |Mouse wheel up             |
+|MW_DOWN, MW_DN |Mouse wheel down           |
+|MS_UP          |Move mouse cursor up       |
+|MS_DOWN, MS_DN |Move mouse cursor down     |
+|MS_LEFT, MS_LT |Move mouse cursor left     |
+|MS_RIGHT, MS_RT|Move mouse cursor right    |