Add Timer plugin (15361037-bbb1-440a-b98c-aff5825f28a2) to PluginsManifest

[starfi11]

No description provided.

[cibere]

1. Please setup a github workflow to handle the building and packaging of your plugin for releases. (Relevant Docs)
2. Please do not push your bin and lib files directly to your repository, instead build them inside of the workflow I mentioned above.
3. Please expand on how to use your plugin in your repository's readme file
4. In your plugin's plugin.json file, the Website key points to a non-existent repository (https://github.com/starfi11/flow_timer_plugin).

[starfi11]

Thanks for the review. I've completed all the requested changes:

1. Added a GitHub Actions workflow to handle building and packaging of the plugin.
2. Removed all bin and lib folders from the repository.
3. Updated the README with detailed usage instructions and screenshots.
4. Fixed the Website field in plugin.json, which now points to the correct repository

Let me know if anything else needs to be addressed. Thanks again!