Display mod goal on connection

[BenjaminJacobs1]

Especially for rookies and all peoples discovering the mod it will be good to have a kind of motd/text to explain them the basic concept.
"

• As a marine you need to survives all waves of aliens to win a round.
• As an alien you need to kill all the marines before the countdown reach 0

Each X seconds aliens will have more biomass and will unlock lifeforms capabilities.
Both teams wins personal resources over time, and are free to use them as they want.
"

[GhoulofGSG9]

Something like this should probably be added to the ready room team selection menu