anavi-arrows: Add ANAVI Arrows

Add support for ANAVI Arrows: an open source programmable mini
hot-swappable mechanical keyboard with 4 keys, a rotary encoder,
mini OLED I2C yellow-blue display and Seeed XIAO RP2040. This is
an open source hardware device designed with KiCad.

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

boards/anavi/anavi-arrows/arrows.py

@@ -0,0 +1,20 @@
+'''
+KMK keyboard for ANAVI Arrows
+
+This is a macro pad with 4 mechanical switches based on the RP2040. Each key is
+attached to a single GPIO, so the KMK matrix scanner needs to be overridden.
+'''
+
+import board
+
+from kmk.kmk_keyboard import KMKKeyboard
+from kmk.scanners.keypad import KeysScanner
+
+
+class AnaviArrows(KMKKeyboard):
+    '''
+    Default keyboard config for ANAVI Arrows.
+    '''
+
+    def __init__(self):
+        self.matrix = KeysScanner([board.D1, board.D2, board.D3, board.D6])