add Slab-Hackpad

hackpads/slab-hackpad/README.md

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+# Slab-Hackpad
+
+A module of the slab v3 keyboard project.
+See [headblockhead/slab](https://github.com/headblockhead/slab) for the main project.
+
+## BOM
+
+### PCB
+- 1x Seeduino Xiao rp2040
+- 2x PCA9555PW I2C I/O Expander
+- 1x SN74AHCT125PWR
+- 2x 0603 10k resistors
+- 2x 0603 2.2k resistors
+- 1x MMBT3906 PNP transistor
+- 1x SSD1306
+- 1x HYDZ HYG-7525A-5027
+- 2x Korean Hroparts Elec PJ-320D-4A 3.5mm TRRS jacks
+- 1x (M+FM pair) [Adafruit 5358 magnetic connectors](https://www.adafruit.com/product/5358)
+- 32x 0603 100nF capacitors
+- 20x Kailh CPG151101S11 hotswap sockets
+- 29x SK6812MINI-E
+
+### Case
+- 9x M3\*5.7\*4.6 heat-set inserts
+- 7x M3x12mm screws
+- 2x M3x10mm screws
+- 20x Cherry MX compatible keyswitches

hackpads/slab-hackpad/cad/README.md

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+# CAD
+
+Designed in FreeCAD 1.0.0RC2. See [headblockhead/slab-case](https://github.com/headblockhead/slab-case/tree/7c872f206a9127521f216f08db1c81cdc8f5a9a2) for the source.

hackpads/slab-hackpad/firmware/README.md

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+# Firmware
+
+See [slab-firmware](https://github.com/headblockhead/slab-firmware/tree/92037594f8dd5fabc9ddaddcd3e0236c4d415475) for the source.