feat(extensions): most of the extensions implementation, by kdb424

boards/boardsource/3x4/README.md

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+# Boardsource 3x4
+
+![Boardsource3x4](https://boardsource.imgix.net/30171267-d988-46cc-ba03-9f6a8ab96487.jpg?raw=true)
+
+This macro pad / small 12 key was inspired by the plaid look
+
+kb.py is designed to work with the nice!nano
+
+Retailers (USA)  
+[Boardsource](https://boardsource.xyz/store/5ecc2008eee64242946c98c1)  
+
+Extentions enabled by default  
+- [Layers](https://github.com/KMKfw/kmk_firmware/tree/master/docs/layers.md) Need more keys than switches? Use layers.

boards/boardsource/3x4/kb.py

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+import board
+
+from kmk.kmk_keyboard import KMKKeyboard as _KMKKeyboard
+from kmk.matrix import DiodeOrientation
+
+
+class KMKKeyboard(_KMKKeyboard):
+    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)
+    diode_orientation = DiodeOrientation.COLUMNS
+    i2c = board.I2C
+    powersave_pin = board.P0_13

boards/boardsource/3x4/main.py

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+from kb import KMKKeyboard
+from kmk.keys import KC
+from kmk.modules.layers import Layers
+
+keyboard = KMKKeyboard()
+
+# Cleaner key names
+_______ = KC.TRNS
+XXXXXXX = KC.NO
+
+layers_ext = Layers()
+keyboard.modules = [layers_ext]
+
+RAISE = KC.MO(1)
+
+keyboard.keymap = [
+    [  #Base
+        KC.N0,  KC.N1,  KC.N4,  KC.N7,
+        KC.ENT, KC.N2,  KC.N5,  KC.N8,
+        RAISE,  KC.N3,  KC.N6,  KC.N9
+    ],
+    [  #RAISE
+        _______, _______, _______, _______,
+        _______, _______, _______, _______,
+        _______, _______, _______, _______
+    ]
+]
+
+if __name__ == '__main__':
+    keyboard.go()