Add a detailed installation process to the README.

Also explain how to setup the virtual cable.

Add a configuration file that holds the following properties:

• space around button (padding) x and y
• width and height of button
• amount of columns the buttons need to be displayed in
• color of the button
• color of the background

Configuration file should be written in yaml. The configuration file itself has to be ignored by git. A config.yaml.template has to be present as well.

Add an option to set the font size in the config.

Set the application icon and override the default.

Add option to set background color in config

Because of the types in the config manager the template is outdated and needs to use _ instead of -.

The option for setting the color of buttons is in the config, but it isn't implemented yet.