added contacts and signals

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

@@ -0,0 +1,21 @@
+package de.srsoftware.web4rail.tiles;
+
+import java.util.List;
+import java.util.Vector;
+
+import de.srsoftware.web4rail.Connector;
+import de.srsoftware.web4rail.Plan;
+
+public class SignalS extends Signal{
+	
+	@Override
+	public List<Connector> connections(String from) {
+		switch (from) {
+			case Plan.NORTH:
+				return List.of(new Connector(x,y+1,from));
+			case Plan.SOUTH:
+				return List.of(new Connector(x,y-1,from));
+		}
+		return new Vector<>();
+	}
+}