docs: add README

image-resizer/README.md

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+# image-resizer
+
+Lightweight image resizing CLI written in Go.
+
+## Build
+
+```bash
+go build -o image-resizer
+```
+
+## Usage
+
+```bash
+./image-resizer <input> <output> <width> <height>
+```
+
+## License
+
+Apache-2.0