add bom and readme

Author: SzKristof1

hackpads/switchypad/BOM.md

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+# BOM
+
+| Footprint                              | Quantity | Designation     |
+|----------------------------------------|----------|-----------------|
+| SW_Cherry_MX_1.00u_PCB                 | 9        | SW_Push         |
+| LED_SK6812MINI_PLCC4_3.5x3.5mm_P1.75mm | 2        | SK6812MINI      |
+| XIAO-RP2040-DIP                        | 1        | XIAO-RP2040-DIP |
+| D_DO-35_SOD27_P7.62mm_Horizontal       | 9        | 1N4148          |

hackpads/switchypad/README.md

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+# SwitchyPad
+Made for hackpad v2
+
+## Features
+- 9 hackable buttons that you can program to do whatever you want
+- 2 neopixel LEDs
+- Firmware written with kmk
+
+...and that's it! Do you need anything more? :)
+
+## Why
+I always wanted a macropad, but found them too expensive and unaffordable. So when I saw this opportunity, I instantly said yes and started designing.
+
+## PCB
+Some photos:
+
+![PCB](./images/pcb.png)
+
+![Schematic](./images/schematic.png)
+
+## The case
+The case was designed in Fusion 360, and I think it turned out pretty sick! Take a look:
+
+![Case cover](./images/cover-pscr.png)
+
+![Case body](./images/housing-pscr.png)
+
+## Firmware
+Initially, I wanted to port QMK, but when I wanted to compile the code my installation of QMK MSYS got corrupted, so I went with kmk for this. However I might try QMK again once I get the parts.
+
+## BOM
+Also available in BOM.md.
+| Footprint                              | Quantity | Designation     |
+|----------------------------------------|----------|-----------------|
+| SW_Cherry_MX_1.00u_PCB                 | 9        | SW_Push         |
+| LED_SK6812MINI_PLCC4_3.5x3.5mm_P1.75mm | 2        | SK6812MINI      |
+| XIAO-RP2040-DIP                        | 1        | XIAO-RP2040-DIP |
+| D_DO-35_SOD27_P7.62mm_Horizontal       | 9        | 1N4148          |
+