docs: add README with installation and usage instructions

README.md

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+# shush 🤫
+
+Remove comments from source code files blazingly fast using sed under the hood.
+
+## Installation
+
+### Quick Install (Linux/macOS)
+
+```bash
+curl -sSf https://raw.githubusercontent.com/carlosarraes/shush/main/install.sh | sh
+```
+
+### Manual Download
+
+Download the binary for your platform from the [releases page](https://github.com/carlosarraes/shush/releases).
+
+## Usage
+
+```bash
+# Remove all comments from a file
+shush file.py
+
+# Remove only line comments (// or #)
+shush file.js --inline
+
+# Remove only block comments (/* */)
+shush file.c --block
+
+# Preview what would be removed (dry run)
+shush script.sh --dry-run
+
+# Create a backup before modifying
+shush config.lua --backup
+
+# Verbose output
+shush app.go --verbose
+```
+
+## Supported Languages
+
+| Language | Line Comments | Block Comments |
+|----------|--------------|----------------|
+| Python   | `#`          | -              |
+| JavaScript/TypeScript | `//` | `/* */` |
+| Go       | `//`         | `/* */`        |
+| C/C++    | `//`         | `/* */`        |
+| Java     | `//`         | `/* */`        |
+| Lua      | `--`         | -              |
+| Shell/Bash | `#`        | -              |
+| Ruby     | `#`          | -              |
+| Perl     | `#`          | -              |
+| YAML     | `#`          | -              |
+
+## Options
+
+```
+--inline     Remove only line comments
+--block      Remove only block comments
+--dry-run    Show what would be removed without making changes
+--backup     Create backup file before modification
+--verbose    Show detailed output
+--version    Show version information
+--help       Show help message
+```
+
+## Examples
+
+### Python
+```bash
+# Before
+# This is a comment
+def hello():
+    print("Hello")  # Inline comment
+
+# After running: shush example.py
+def hello():
+    print("Hello")
+```
+
+### JavaScript
+```bash
+# Remove only line comments, preserve block comments
+shush app.js --inline
+
+# Remove only block comments, preserve line comments
+shush app.js --block
+```
+
+### Backup and Preview
+```bash
+# Always create backup before modifying
+shush important.go --backup
+
+# See what would be removed first
+shush config.yaml --dry-run --verbose
+```
+
+## How It Works
+
+shush uses optimized sed commands to remove comments while preserving code structure. It:
+- Auto-detects language from file extension
+- Builds appropriate sed patterns for the detected language
+- Removes comments and empty lines in a single pass
+- Preserves strings and code that might look like comments
+
+## Building from Source
+
+```bash
+git clone https://github.com/carlosarraes/shush.git
+cd shush
+go build -o shush
+```
+
+## Requirements
+
+- sed (available on all Unix-like systems)
+- Linux or macOS (x86_64 or ARM64)
+
+## License
+
+MIT