Add support for specific dotfile patterns and exclusions

This pull request implements issue #3 by adding comprehensive pattern matching support for dotfiles, allowing users to include or exclude specific files using glob patterns.

🚀 New Features

Command-line Pattern Support

• Include patterns (-i, --include): Specify glob patterns for files to include
• Exclude patterns (-e, --exclude): Specify glob patterns for files to exclude
• Multiple patterns: Support for multiple include/exclude patterns in a single command
• Pattern precedence: Exclude patterns take precedence over include patterns

Configuration Management

• Default patterns: Save default include/exclude patterns in configuration
• Config commands: New config set-patterns and config show-patterns commands
• Persistent storage: Patterns are stored alongside repository aliases in ~/.dotme/config.json

Pattern Matching Engine

• Glob support: Full glob pattern matching with *, ?, [...], and {...} support
• Flexible filtering: Patterns work with both files and directories
• Smart defaults: When no patterns specified, defaults to copying all dotfiles

📋 Usage Examples

# Include only vim-related dotfiles
dotme -i ".vim*" -i ".vimrc" https://github.com/user/dotfiles

# Exclude backup and cache files
dotme -e "*.bak" -e "*cache*" https://github.com/user/dotfiles

# Combine include and exclude patterns
dotme -i ".config/*" -e ".config/cache" https://github.com/user/dotfiles

# Set default patterns for future use
dotme config set-patterns --include ".vim*,.zsh*" --exclude "*.log,*cache*"

# Use saved alias with custom patterns
dotme -a my-dotfiles -e "*.tmp"