feat: add readme

README.md

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+# Go Raycasting Engine
+
+This is a simple raycasting engine implemented in Go using SDL2. It simulates a 3D environment similar to the rendering technique used in classic games like Wolfenstein 3D.
+
+## Features
+
+- Real-time 3D projection with raycasting
+- Movement and rotation controls
+- Multiple wall textures loaded from PNG files
+- Text rendering (e.g., FPS counter or debug text)
+- SDL2 rendering (no OpenGL or GPU shaders required)
+
+## Screenshots
+
+![screenshot](assets/screenshot.png) <!-- Replace with your actual screenshot -->
+
+## Controls
+
+| Key | Action              |
+|-----|---------------------|
+| W   | Move Forward        |
+| S   | Move Backward       |
+| A   | Rotate Left         |
+| D   | Rotate Right        |
+| F1  | Toggle FPS Counter  |
+| ESC | Exit Program        |
+
+## Requirements
+
+- Go 1.20+  
+- SDL2 (development libraries)  
+- SDL2_ttf (for text rendering)
+
+## Asset Licenses
+- DejaVuSans.ttf
+
+From the [DejaVu fonts project](https://dejavu-fonts.github.io/)
+
+License: [Bitstream Vera Fonts License](https://dejavu-fonts.github.io/License.html) (Free to use, modify, distribute)
+
+- Wolfenstein 3D Textures
+
+These textures are derived from the original Wolfenstein 3D game by id Software.
+
+Note: The original game assets are not open source and are copyright © id Software.