Adds a message to those listed in the frame. If the frame was already 'full' with messages, then the oldest message is discarded when the new one is added.
Signature:
MessageFrame:AddMessage("text" [, red [, green [, blue [, alpha]]]])
Arguments:
text- Text of the message (string)red- Red component of the text color for the message (0.0 - 1.0) (number)green- Green component of the text color for the message (0.0 - 1.0) (number)blue- Blue component of the text color for the message (0.0 - 1.0) (number)alpha- Alpha (opacity) for the message (0.0 = fully transparent, 1.0 = fully opaque) (number)