docs: update README with usage and features
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-# showmycode-private-demo
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+# showmycode-private-demo
+
+A simple internal CLI tool for generating project statistics.
+
+> This is a private demo repository used to showcase [showmycode](https://github.com/Jiseoup/showmycode).
+
+## Usage
+
+```bash
+node src/index.js ./path/to/project
+```
+
+## Features
+
+- Count files by extension
+- Calculate total lines of code
+- Show directory size breakdown
+- Export results as JSON