[TODO] Capabilities / Server info

[Goobwabber]

Add an api serverside that servers can use to tell clients what they are capable of doing (for features that do go beyond the BeatGames server standard. Add an api to the mod for other mods to get this info. Also go ahead and include a description and images in there as well :D

The start to crazy stuff happening in multiplayer

[Goobwabber]

oh yeah info endpoint should also include the max players value pls