Added the Ultrasonic sensor file and the code to find the distance in front of the robot.

ultrasonicSensor/ultrasonicSensor.ino

@@ -0,0 +1,21 @@
+
+#include "MeMCore.h"
+#include "Arduino.h"
+#include "Wire.h"
+
+#include "SoftwareSerial.h"
+
+MeUltrasonicSensor ultraSensor(PORT_3);
+
+void setup() {
+  Serial.begin(9600);
+
+}
+
+void loop() {
+ Serial.print("Distance : ");
+  Serial.print(ultraSensor.distanceCm() );
+  Serial.println(" cm");
+  delay(500); /* the minimal measure interval is 100 milliseconds */
+
+}