implemented bridge

src/main/java/de/srsoftware/web4rail/tiles/BridgeN.java

@@ -0,0 +1,30 @@
+package de.srsoftware.web4rail.tiles;
+
+import java.util.List;
+import java.util.Map;
+
+import de.srsoftware.web4rail.Connector;
+import de.srsoftware.web4rail.Plan.Direction;
+import de.srsoftware.web4rail.tiles.Turnout.State;
+
+public class BridgeN extends Bridge {
+	@Override
+	public List<Direction> possibleDirections() {
+		return List.of(Direction.NORTH);
+	}
+	
+	@Override
+	public Map<Connector, State> connections(Direction from) {
+		if (isSet(counterpart)) switch (from) {
+			case NORTH:
+				return Map.of(counterpart.connector(),State.UNDEF);
+			default:					
+		}
+		return super.connections(from);
+	}
+	
+	@Override
+	protected Connector connector() {
+		return new Connector(x, y-1, Direction.SOUTH);
+	}
+}