Add core game mode framework

Config/DefaultPHYCore.ini

@@ -3,3 +3,13 @@ ConfigVersion=1
 bMultiplayerFirst=True
 bPreferCodeAndConfig=True
 TargetPlatformName=Win64
+
+[/Script/PHY.PHYGameFrameworkSettings]
+DefaultPawnClass="/Script/PHY.PHYPlayerCharacter"
+PlayerControllerClass="/Script/PHY.PHYPlayerController"
+PlayerStateClass="/Script/PHY.PHYPlayerState"
+GameStateClass="/Script/PHY.PHYGameState"
+HUDClass="/Script/PHY.PHYHUD"
+SpectatorClass="/Script/Engine.SpectatorPawn"
+bUseSeamlessTravel=True
+bStartPlayersAsSpectators=False