Adds a floating action button.
Example - AddFAB
cfg.Light
cfg.MUI
function OnStart()
{
lay = MUI.CreateLayout("Linear", "VCenter,FillXY")
fab1 = MUI.AddFAB(lay, "favorite", null, "default")
fab2 = MUI.AddFAB(lay, "favorite", MUI.colors.deepPurple.lighten1, "outline")
fab3 = MUI.AddFAB(lay, "favorite", MUI.colors.teal.darken1, "elegant")
app.AddLayout(lay)
}