Add touch example

libraries/ESP32/examples/Touch/TouchInterrupt/TouchInterrupt.ino

+/*
+This is un example howto use Touch Intrrerupts
+The bigger the threshold, the more sensible is the touch
+*/
+
+int threshold = 40;
+bool touch1detected = false;
+bool touch2detected = false;
+
+void gotTouch1(){
+ touch1detected = true;
+}
+
+void gotTouch2(){
+ touch2detected = true;
+}
+
+void setup() {
+  Serial.begin(115200);
+  delay(1000); // give me time to bring up serial monitor
+  Serial.println("ESP32 Touch Interrupt Test");
+  touchAttachInterrupt(T2, gotTouch1, threshold);
+  touchAttachInterrupt(T3, gotTouch2, threshold);
+}
+
+void loop(){
+  if(touch1detected){
+    touch1detected = false;
+    Serial.println("Touch 1 detected");
+  }
+  if(touch2detected){
+    touch2detected = false;
+    Serial.println("Touch 2 detected");
+  }
+}