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README.md

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+# spritestitch
+
+`spritestitch` is a tiny Go CLI tool that stitches multiple image files into a single spritesheet, either horizontally or vertically. It supports PNG, JPEG, and GIF inputs and always outputs a PNG.
+
+## Features
+
+- Join multiple images into one spritesheet
+- Horizontal or vertical layout
+- Supports PNG/JPEG/GIF as input
+- Outputs a single PNG file
+- Simple command-line interface
+
+## Installation
+
+Make sure you have [Go](https://go.dev/) installed (1.20+ recommended).
+
+```bash
+git clone https://github.com/mr0xb/spritestitch.git
+cd spritestitch
+go build -o spritestitch .
+```
+
+## Usage
+``` bash
+spritestitch -o output.png -direction [h|v] sheet1.png sheet2.png ...
+```