Create a new script either by right-clicking on Project Window, hovering over the Create tab, and clicking on the C# script, or by navigating through the Assets menu and creating the new C# script this way. Once you have done this, rename the script ControlConfig.

After you have created and named the script, open it. Ensure that the class name, ControlConfig, is the same as the filename. You'll see that Unity has created the start and update functions for use already. You should delete both of these functions, which will leave you with an open and empty class.