Add project documentation

- Create comprehensive README with feature overview
- Include build instructions for devkitPro toolchain
- Add usage instructions and safety warnings
- Professional documentation for project release

README.md

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+# BOTW Completer
+
+Nintendo Switch homebrew tool for managing Korok seed locations in Breath of the Wild.
+
+## Features
+
+- Add missing Korok seed pins to your map
+- Remove all existing map pins 
+- Fix corrupted map pin data
+- Sort Koroks by distance from player
+
+## Building
+
+Requires devkitPro toolchain:
+
+```bash
+make
+```
+
+## Usage
+
+Run via homebrew launcher. Use the on-screen menu to select options.
+
+**Warning:** This modifies save data. Back up your saves first.