anavi/knobs3: Add ANAVI Knobs 3

Add support for ANAVI Knobs 3: an open source programmable mini
mechanical keyboard with 3 rotary encoders and Seeed XIAO RP2040.
This is open source hardware designed with KiCad.

Signed-off-by: Leon Anavi <leon@anavi.org>

boards/anavi/knobs3/anaviknob.py

@@ -0,0 +1,25 @@
+'''
+KMK keyboard for ANAVI Knobs 3
+'''
+
+import board
+
+from kmk.kmk_keyboard import KMKKeyboard
+from kmk.scanners.keypad import KeysScanner
+
+# fmt: off
+_KEY_CFG = [
+    board.D0,
+    board.D3,
+    board.D6
+]
+# fmt: on
+
+
+class AnaviKnob(KMKKeyboard):
+    '''
+    Default keyboard config for the Keybow2040.
+    '''
+
+    def __init__(self):
+        self.matrix = KeysScanner(_KEY_CFG)