Update badge.md with detailed badge information

Added detailed information about the Fall CTF 2025 badge, including its features, physical and software setup instructions, and badge hacking tips.

Author: richyliu

guides/fallctf-2025/badge.md

@@ -3,5 +3,23 @@ title: Badge
 ---
 # Fall CTF 2025 Badge
 
+The Fall CTF 2025 badge is your all-in-one connectivity tool and gaming device for Fall CTF 2025. It contains an ESP32-S2 module with Wi-Fi, allowing for seamless communication between multiple badges. Each badge also has an accelerometer and joystick for interactive control. To power the device, each badge features a 400mAh 3.7V Li-po battery. The badge runs Micropython for ease-of-use and hacking.
+
 ## Connect your badge to your computer
-There is a USB-C port on the side of the badge, which is intended to connect to your computer.
+
+### Physical setup
+
+There is a USB-C port on the side of the badge, which is intended to connect to your computer. You may use any USB-C cable with data.
+
+### Software setup
+
+Install the `mpremote` Python package to connect to the badge:
+```sh
+pip install --user mpremote
+```
+
+From there, type `mpremote` to open a REPL on the badge. Press Ctrl-C to interrupt the current running program and Ctrl-D to reboot the badge. Press Ctrl-X to exit the prompt.
+
+## Badge hacking
+
+Check out the src.zip for the source code. Run `mpremote ls` to list files and `mpremote cp :src.zip .` to copy files from the device (in this example, `src.zip`).