Encoder module! (#211)

* added atreus62 board

* Uploaded module for encoder support

* Update README.md


Co-authored-by: Ryan Pullen <rpullen@martinuav.com>

docs/encoder.md

@@ -0,0 +1,58 @@
+# Encoder
+Add twist control to your keyboard! Volume, zoom, anything you want.
+
+## Enabling the extension
+The constructor takes a minimun of 3 arguments: a list of pad_a pins, a list of pad_b pins, 
+and an encoder_map.  The encoder_map is modeled after the keymap and works the
+same way. It should have as many layers as your keymap, and use KC.NO keys for 
+layers that you don't require any action.  The encoder supports a velocity mode
+if you desire to make something for video or sound editing. The direction of 
+increment/decrement can be changed to make sense for the direction the knob is 
+turning by setting the is_inverted flag.
+
+## Configuration
+
+There is a complete example in the Atreus62 main.py
+
+Create your special keys:
+```python
+Zoom_in = KC.LCTRL(KC.EQUAL)
+Zoom_out = KC.LCTRL(KC.MINUS)
+```
+Create the encoder_map.
+
+Anatomy of an encoder_map tuple: (increment_key, decrement_key, keys presses per encoder click)
+
+```python
+
+# create the encoder map, modeled after the keymap
+encoder_map = [
+    [
+        # Only 1 encoder is being used, so only one tuple per layer is required
+        # Increment key is volume up, decrement key is volume down, and sends 2 
+        # key presses for every "click" felt while turning the encoder.
+        (KC.VOLU,KC.VOLD,2),
+    [
+        # only one key press sent per encoder click
+        (Zoom_in, Zoom_out,1),
+    ],
+    [
+        # No action keys sent here, the resolution is a dummy number, to be 
+        # removed in the future.
+        (_______,_______,1),#
+    ]
+]
+
+# create the encoder instance, and pass in a list of pad a pins, a lsit of pad b 
+# pins, and the encoder map created above
+encoder_ext = EncoderHandler([board.D40],[board.D41], encoder_map)
+
+# if desired, you can flip the incrfement/decrement direction of the knob by
+# setting the is_inerted flag to True.  If you turn the knob to the right and 
+# the volume goes down, setting this flag will make it go up.  It's default
+# setting is False
+encoder_ext.encoders[0].is_inverted = True
+
+# Make sure to add the encoder_ext to the modules list
+keyboard.modules = [encoder_ext]
+```