edited the 'networkDialog' and added 'battleShipLocalServer' and 'ReceivedMessage' and 'README'

edited the networkDialog so the client can decide, whether he want, to connect to a derver or create and host a new one, added the 'BattleshipLocalServer', the class responcible for creating a new server and added 'Receivedmessage'
and added a README for the Background-music licence

Projekte/battleship/model/src/main/resources/battleship.properties

@@ -40,3 +40,4 @@ map.doesnt.fit=The map doesn't fit to this game
 background.music.checkbox= Background music on/off
 background.music.volume= Background volume
 player.submitted.invalid.map= invalid map submitted
+local.server= instantiate local server

Projekte/battleship/model/src/main/resources/battleship_de.properties

@@ -40,4 +40,5 @@ map.doesnt.fit=Diese Karte passt nicht zu diesem Spiel
 background.music.checkbox= Musik an/aus
 background.music.volume= Musiklautstärke
 player.submitted.invalid.map= Invalide karte gegeben
+local.server=Lokalen Server erstellen