Add notification when new missions are available

Strategic/Rebel Command.cpp

@@ -324,6 +324,7 @@ enum RebelCommandText // keep this synced with szRebelCommandText in the text fi
 	RCT_CONFIRM_CHANGE_ADMIN_ACTION_PROMPT,
 	RCT_INSUFFICIENT_SUPPLIES_ADMIN_ACTIONS_DISABLED,
 	RCT_NEW_MISSIONS_AVAILABLE_TIME,
+	RCT_NEW_MISSIONS_AVAILABLE_NOTIFICATION,
 	RCT_MISSION_PREP_IN_PROGRESS,
 	RCT_MISSION_DURATION_DAYS,
 	RCT_MISSION_SUCCESS_CHANCE,
@@ -3936,6 +3937,8 @@ void DailyUpdate()
 				idx++;
 			}
 		}
+
+		ScreenMsg(FONT_MCOLOR_LTYELLOW, MSG_INTERFACE, szRebelCommandText[RCT_NEW_MISSIONS_AVAILABLE_NOTIFICATION]);
 	}
 }