Add colon3pad

hackpads/colon3pad/.gitmodules

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+[submodule "OPL_Kicad_Library"]
+	path = PCB/OPL_Kicad_Library
+	url = https://github.com/Seeed-Studio/OPL_Kicad_Library/
+[submodule "kiswitch"]
+	path = PCB/kiswitch
+	url = https://github.com/kiswitch/kiswitch
+[submodule "Keebio-Parts.pretty"]
+	path = PCB/Keebio-Parts.pretty
+	url = https://github.com/keebio/Keebio-Parts.pretty
+[submodule "KiCad-SSD1306-0.91-OLED-4pin-128x32.pretty"]
+	path = PCB/KiCad-SSD1306-0.91-OLED-4pin-128x32.pretty
+	url = https://github.com/gorbachev/KiCad-SSD1306-0.91-OLED-4pin-128x32.pretty
+[submodule "PCB/mbk-footprints"]
+	path = PCB/mbk-footprints
+	url = https://github.com/FKcaps/mbk-footprints

hackpads/colon3pad/BOM.md

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+# BOM
+
+For PCB:
+- 1x Seeed Studio XIAO RP2040 
+- 1x SSD1306 128x32 OLED 
+- 16x Kailh Choc V2 switches
+- 16x SK6812-E reverse mount NeoPixel LEDs
+- 16x 1N4148 diodes 
+
+For Case:
+- Case is 3D printed with PLA
+- 4x M3x12mm screws
+- 4x M3 hex nuts
+- 4x M3x5mx4mm heatset inserts
+- 15x 1u low profile key caps ([compatibility list](https://docs.google.com/spreadsheets/d/1ylYmEZ1jNiPuHWl6rjiI3xzooOwUTS33BZfYSW-n7Ok/edit?gid=0#gid=0))
+- 1x 2u low profile key cap