Add readme, more hax files

README.md

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+# true's RGB Addon Addon for DC31 Badge
+
+This is the firmware for true's RGB Addon Addon, a shard addon for the official DEF CON 31 badge.
+
+## Specifications
+
+- HK32F030MF4P6 MCU (16K flash, 4K RAM)
+- Type-C USB Port 
+    - Supports charging with dumb 5V or PD chargers
+    - XMODEM bootloader over Type-C for field firmware updates
+- 8x addressable RGBLED in 3 zones
+- Several RGB programs
+- Accelerometer
+- Hosts GAT / SAO Addons
+
+## User manual
+
+A hastily put together user manual can be found at https://dc31.truecontrol.org/yearsite/manual/addon-addon
+
+
+## Building
+
+This project was built with STM32CubeIDE, which normally only works with ST MCUs. In the `hax/` directory you'll find replacement files to place over STM32CubeIDE v1.21.1 and v1.13.0. This has only been tested with v1.12.1.
+
+<p></p>Downloads for STM32CubeIDE:
+
+- Any version (requires ST account): [STM32CubeIDE Page](https://www.st.com/en/development-tools/stm32cubeide.html)
+- Latest (no account needed): [FileCR](https://filecr.com/windows/stm32-software-ide-prog/)
+
+Use a J-Link to debug and program.. If you want to get shady with it, you can flash F103 blue pill with an OB firmware containing a modified date code. Check the internet for pinouts.
+
+## Using the bootloader
+
+Activate the bootloader by holding down the `PROG` button on the badge while turning on. Use your favorite terminal to connect to the badge using the VCP at `115200-8-N-1`. Send a `firmware.hex` file via XMODEM to update.
+
+Ensure the firmware you send is built with the bootloader target in mind. The uploaded binary will start at `0x8000800` in Flash.