update README

README.md

@@ -1,20 +1,88 @@
 # EPUB to MDBook Converter
 
-This is a powerful tool to convert EPUB files to MDBook format.
+[![Crates.io](https://img.shields.io/crates/v/epub2mdbook.svg)](https://crates.io/crates/epub2mdbook)
+[![License: MIT](https://img.shields.io/badge/License-MIT-blue.svg)](LICENSE)
 
-## Usage
+A fast and reliable tool to convert EPUB e-books to [MDBook](https://github.com/rust-lang/mdBook) format.
 
-### CLI
+## Features
+
+- 📖 Converts EPUB content (XHTML/HTML) to Markdown
+- 📑 Automatically generates `SUMMARY.md` from the EPUB table of contents
+- 📝 Creates `book.toml` with metadata (title, authors, description, language)
+- 🖼️ Preserves images and other resources
+- 🔗 Fixes internal links to point to converted Markdown files
+
+## Installation
+
+### From crates.io
 
 ```bash
 cargo install epub2mdbook
-epub2mdbook path/to/input.epub --output-dir path/to/output
 ```
 
-### Rust
+### From source
+
+```bash
+git clone https://github.com/cyborg42/epub2mdbook.git
+cd epub2mdbook
+cargo install --path .
+```
+
+## Usage
+
+### Command Line
+
+```bash
+# Basic usage - creates a subdirectory named after the book
+epub2mdbook book.epub
+
+# Specify output directory
+epub2mdbook book.epub --output-dir ./output
+
+# Output directly to the directory without creating a subdirectory
+epub2mdbook book.epub --output-dir ./my-book --flat
+```
+
+### As a Library
+
+Add to your `Cargo.toml`:
+
+```toml
+[dependencies]
+epub2mdbook = "0.16"
+```
+
+Then use in your code:
 
 ```rust
 use epub2mdbook::convert_epub_to_mdbook;
 
-convert_epub_to_mdbook("path/to/input.epub", "path/to/output", true);
+fn main() -> Result<(), epub2mdbook::error::Error> {
+    // Creates ./output/book_name/ with the converted content
+    convert_epub_to_mdbook("book.epub", "./output", true)?;
+
+    // Or output directly to ./my-book/ without subdirectory
+    convert_epub_to_mdbook("book.epub", "./my-book", false)?;
+
+    Ok(())
+}
 ```
+
+## Output Structure
+
+```
+output/
+└── book_name/
+    ├── book.toml
+    └── src/
+        ├── SUMMARY.md
+        ├── chapter1.md
+        ├── chapter2.md
+        └── images/
+            └── cover.png
+```
+
+## License
+
+This project is licensed under the MIT License