How do I develop an extension for the vtiger open crm timeline?

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To develop an extension for the vtiger open crm timeline, follow these steps:

1. Install the vtiger open crm timeline on your server.

2. Create a new module for your extension.

3. Define the fields that you want to add to the timeline module.

4. Create the necessary database tables for your extension.

5. Add the necessary code to the timeline module to connect to your extension.

6. Test your extension to ensure it works with the vtiger open crm timeline.

7. Create documentation for your extension, including installation and usage instructions.

8. Submit your extension to the vtiger marketplace if you want to share it with other users.

9. Keep your extension up to date with new versions of the vtiger open crm timeline.