Admin notice will be shown in the admin dashboard when the license key is not active for the plugin

To add this feature to the plugin, you can follow the below steps:

1. Copy the ts-active-license-notice.php file into your plugin folder. 

2. Include the file once when on the admin page. This can be done with is_admin() function. 

3. Change the value of the $plugin_name, $plugin_license_option variables of the TS_Welcome class with the values of your plugin.

4. Change the plugin folder name and main file in the ts_get_version and ts_get_plugin_url function.

5. Once done. A notice will be displayed informing customers that the license key is deactivated.
