This is a simple widget that makes use of an entity to store either integer or decimal values.
Once you add the widget, you would need to map it to a rating entity with sufficient security permissions. The Rating can be an integer or a decimal value. The documentation is pretty straight forward. Let me know if you need any additional help.
You can refer the following app https://rating100.mxapps.io
Use UN: x/y/z and Password : 1 to login