Add .npmignore, LICENSE.txt, and update README.md

- Created a .npmignore file to exclude unnecessary files and directories from npm packages.
- Added LICENSE.txt to specify the licensing terms for the project.
- Expanded README.md to include detailed plugin features, installation instructions, usage guidelines, and contribution information.
- Updated package.json to reflect new repository URLs for issues and homepage.

README.md

@@ -1 +1,80 @@
-# strapi-plugin-checkbox-list
+# Strapi Checkbox List Plugin
+
+A custom field plugin for Strapi v5 that extends the Content Type Builder with a flexible checkbox list component. Enable content editors to select multiple values from predefined options with an intuitive interface that seamlessly integrates into the Strapi admin panel.
+
+## Features
+
+- **Multi-select interface**: Intuitive checkbox-based selection for content editors
+- **Flexible configuration**: Define custom option lists for each field instance
+- **Native integration**: Works seamlessly within Strapi's Content Type Builder
+- **Type-safe**: Full TypeScript support for enhanced development experience
+
+## Requirements
+
+- Node.js and npm compatible with Strapi v5
+- Strapi `@strapi/strapi` ^5.35.0
+
+## Installation
+
+Install the package in your Strapi project:
+
+```bash
+npm install strapi-plugin-checkbox-list
+```
+
+Restart your Strapi application, then navigate to the Content Type Builder to add the **Checkbox list** custom field to your content types.
+
+## Usage
+
+After installation, the Checkbox list field type will be available in the Content Type Builder:
+
+1. Open Content Type Builder
+2. Select a content type or create a new one
+3. Click "Add another field"
+4. Choose "Checkbox list" from the custom fields
+5. Configure your checkbox options
+6. Save and use in your content entries
+
+## Contributing & Support
+
+This project is actively maintained and welcomes contributions. Issues and pull requests can be submitted through either repository:
+
+- **Primary development**: [valentineus/strapi-plugin-checkbox-list](https://code.popov.link/valentineus/strapi-plugin-checkbox-list/issues)
+- **GitHub mirror**: [valentineus/strapi-plugin-checkbox-list](https://github.com/valentineus/strapi-plugin-checkbox-list/issues)
+
+Development primarily takes place on the self-hosted Git instance, with GitHub serving as a mirror for broader accessibility.
+
+**Maintainer**: Valentin Popov <valentin@popov.link>
+
+## Development
+
+Build the plugin:
+
+```bash
+npm install
+npm run build
+```
+
+For active development with automatic rebuilds:
+
+```bash
+npm run watch
+```
+
+To run the test Strapi app from `playground/`:
+
+```bash
+cd playground
+npm install
+npm run develop
+```
+
+If you need the plugin linked into the playground app, use the Strapi plugin linker and point it at `playground/`:
+
+```bash
+npm run watch:link
+```
+
+## License
+
+This project is licensed under the [MIT License](LICENSE.txt).