Added Proximity Sensor code

Arduino/proximity_sensor/proximity_sensor.ino

@@ -0,0 +1,21 @@
+const int Pin=2;
+void setup()
+{
+pinMode(Pin, INPUT);
+Serial.begin(9600);
+}
+void loop()
+{
+int sensorValue = digitalRead(Pin);
+if(sensorValue==LOW)
+{
+Serial.println("no Object");
+delay(500);
+}
+else
+{
+Serial.println("Object Detected");
+delay(500);
+}
+}
+