Add gpad, a small 4 key macropad

hackpads/gpad/README.md

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+# gpad
+a small keypad for playing games with relativly few controls
+
+## Inspiration
+Recently, I started to play games that required only a few amount of keys to play.  Combined with a heightened interest in hardware, I decided I wanted to create a small macropad to fulfil this interest.
+Initially I decided to create two separate macropads but time and design constraints proved to be too tight for that to be realized.
+
+### assembly
+![assembly](assembly.png)
+
+### cad
+![cad](cad.png)
+
+### pcb
+![pcb](pcb.png)
+
+### schematic
+![schematic](schematic.png)
+
+## BOM
+- 2x 3D case (for top and bottom layer)
+- 4x MX-Style switches
+- 1x Seeed XIAO RP2040
+- 4x White Blank DSA keycaps
+- 4x M3x16mm screws
+- 4x M3 hex nuts