added detectSpeedLimit

RoadSensor.java

@@ -8,4 +8,13 @@ public class RoadSensor {
         laneEdges[0] = 1;
         laneEdges[1] = 1.1;
     }
+
+    public int detectSpeedLimit() {
+        //image intepretation api call to review any street signs with a speed limit marking
+        //in practice this will be combined with route mapping data to confirm current
+        //speed limits
+        return 45;
+    }
+
+    
 }