Add firepad

hackpads/firepad/README.md

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+# Firepad
+## Firepup's macropad
+
+Primarily intended as a general-use hackpad, I intend to use most of the extra F-keys for stream keybinds, although I've given myself more of those then I needed.
+
+### Pictures
+
+#### Above
+![Above View](firepad-assets/firepad-above.png)
+#### Diagonal
+![Diagonal View](firepad-assets/firepad-diagonal.png)
+#### Below
+![Below View](firepad-assets/firepad-below.png)
+#### PCB
+![PCB View](firepad-assets/firepad-pcb.png)
+#### 3D PCB
+![3D PCB View](firepad-assets/firepad-pcb-3D.png)
+#### Schematic
+![Schematic View](firepad-assets/firepad-schematic.png)
+
+### Frimware
+
+The top three buttons (from left to right) are:
+- Skip Backward
+- Pause/Play
+- Skip Forward
+
+The next 5 buttons are F13-F17, the next five F18-F22, and the last two are F23 and F24.
+
+The rotary encoder is volume control, and can be clicked to mute.
+
+Clicking any button will slightly adjust the color of the power LED, and the mute key will switch on/off the mute LED, although it might be inverted, since I don't think I can detect host mute status.
+
+### BOM
+- 1x Seeed XIAO RP2040
+- 15x Cherry MX Switches
+- 1x EC11 Rotary encoder
+- 15x Blank DSA keycaps (Red, preferably)
+- 2x SK6812 MINI-E LEDs
+- 4x M3x16mm screws
+- 4x M3 hex nuts
+- 4x M3x5mx4mm heatset inserts
+- 1x MCP23017 io expander chip
+- 1x Case (2 printed parts)
+
+### TODO:
+- Double check BOM & try to find prices