Better Document the protocol and provide some basic examples

[sofoxe1]

currently some of the types have comments but there is no higher level documentation for example how server behaves, what msg types are used for what and when (one can try to guess that based on a name but that's not an ideal solution),
it would also be nice if there was some basic example for both server and client to eliminate the need of going thorough slimevr projects source code to figure out where to start