Enhance Documentation for Custom Configuration Options

[grasmarcussanti129]

Suggestion

The current README provides a good overview of the action's features and usage. However, there seems to be a lack of detailed information regarding the customization options for PHPCS standards, extensions, and ignoring specific rules.

Proposed Enhancements:

1. Detailed Examples: Include specific examples of how to set the extensions, ignore, and standard parameters in the YAML configuration. For instance:

   inputs:
     extensions: 'php,yml'
     ignore: 'path/to/ignore/**/*'
     standard: 'PSR12'

2. Description of Common Standards: Provide a brief description of common PHPCS standards that users might want to use, along with links to the relevant documentation.
3. Error Messages: Explain common error messages that users might encounter during checks and potential solutions or links to resolving them.

These additions could significantly improve user experience by helping users understand how to customize the action for their specific projects effectively.