added offsetmx43 board

boards/jpconstantineau/offsetmx43/README.md

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+# JPConstantineau's OffsetMX43: A 40% Staggered keyboard
+
+![OffsetMX43](https://cdn.tindiemedia.com/images/resize/Y9o1UdtekCSE5Jp5FesV2Q3qvCE=/p/fit-in/653x435/filters:fill(fff)/i/556481/products/2021-10-26T23%3A40%3A53.317Z-PXL_20211026_234121626.jpg?1635266543)
+
+43 Keys RGB Keyboard the same size as the GridMX47 but with staggered keys instead of ortholinear (keys in a grid).  Uses a Raspberry Pi Pico as the controller.
+
+kb.py is designed to work with the [Pico CircuitPython UF2](https://circuitpython.org/board/raspberry_pi_pico/)
+
+Retailers (USA)  
+[BlueMicro Store on Tindie](https://www.tindie.com/products/jpconstantineau/43-keys-rgb-keyboard-using-raspberry-pi-pico/)
+
+Extensions enabled by default  
+- [Layers](https://github.com/KMKfw/kmk_firmware/tree/master/docs/layers.md) Need more keys than switches? Use layers.
+- [RGB](https://github.com/KMKfw/kmk_firmware/tree/master/docs/rgb.md) Light it up
+- [MediaKeys](https://github.com/KMKfw/kmk_firmware/tree/master/docs/media_keys.md) Control volume and other media functions

boards/jpconstantineau/offsetmx43/kb.py

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+import board
+
+from kmk.kmk_keyboard import KMKKeyboard as _KMKKeyboard
+from kmk.matrix import DiodeOrientation
+
+
+class KMKKeyboard(_KMKKeyboard):
+    col_pins = (
+        board.GP11,
+        board.GP12,
+        board.GP13,
+        board.GP14,
+        board.GP15,
+        board.GP19,
+        board.GP20,
+        board.GP21,
+        board.GP22,
+        board.GP26,
+        board.GP27,
+        board.GP28,
+    )
+    row_pins = (board.GP7, board.GP8, board.GP9, board.GP10)
+    diode_orientation = DiodeOrientation.COL2ROW
+    rgb_pixel_pin = board.GP6
+    rgb_num_pixels = 47