Add plugin updater

- Initialize package.json with project metadata including name, version, description, and author.
- Define scripts for testing, version bumping, and localization tasks.
- Specify repository and bug tracking information.
- Include development dependency for wp-project-version-sync.

Add package.json for additional-javascript project

- Revised Quick Install section to provide clearer steps for downloading and uploading the plugin.
- Added specific link to the latest plugin release zip file.
- Enhanced Composer Install instructions with proper code formatting.
- Clarified the Updates section to emphasize automatic update handling via GitHub.

…sion 1.1.1

…f use

…gelog entry for minor code improvements.

- Replaced the existing `Additional_JavaScript_Updater` class with a more generic `GitHub_Plugin_Updater` class to enhance maintainability and reusability.
- Updated `additional-javascript.php` to include the new updater class and initialize it with configuration parameters for GitHub integration.
- Removed the old updater class file `class-additional-javascript-updater.php` to eliminate redundancy.
- Added comprehensive documentation in `README-UPDATER.md` detailing the usage and configuration of the new updater class, including examples for basic and advanced setups.

… readme.txt for release. Update stable tag to reflect the new version.

Plugin/updater

…gin GitHub Updater

…kage-lock.json, and readme.txt. Update stable tag to reflect the new version. Adjusted version reference in installed.php for consistency. Enhanced class loading for the GitHub plugin updater.

Bump version to 1.1.4 in additional-javascript.php, package.json, pac…