1 add plus more fix

Added 'Help List'
/simplyxmas help   -   shows the player available commands which they
can only use
Bug Fix -- when a tp location hasn't been set in the config it now
checks for their name under the Locations: [ ] tab first. If they are
not in the file they will not be teleported but prompted with an error
message (plus info)
Updated plugin.yml - added new command
Updated Main.java - added the CommandExecutor for HelpList