Create hall_effect_esp32.ino (espressif#450)

* Create hall_effect_esp32.ino

A simple example to access the hall effect sensor in the esp32

* Create hall_effect.ino

* Update hall_effect.ino

Simple sketch to access the internal hall effect detector on the esp32

* Delete hall_effect_esp32.ino

* Create HallSensor.ino

* Update HallSensor.ino

* Update HallSensor.ino

* Delete hall_effect.ino

Author: sctv

libraries/ESP32/examples/HallSensor/HallSensor.ino

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+//Simple sketch to access the internal hall effect detector on the esp32.
+//values can be quite low. 
+//Brian Degger / @sctv  
+
+int val = 0;
+void setup() {
+  Serial.begin(9600);
+    }
+
+void loop() {
+  // put your main code here, to run repeatedly:
+  val = hallRead();
+  // print the results to the serial monitor:
+  //Serial.print("sensor = ");
+  Serial.println(val);//to graph 
+}