Add Touchread example (#175)

* Add Touchread example

* Rename libraries/ESP32/examples/Touch/TouchRead.ino to libraries/ESP32/examples/Touch/TouchRead/TouchRead.ino

* Update TouchRead.ino

libraries/ESP32/examples/Touch/TouchRead/TouchRead.ino

+// ESP32 Touch Test
+// Just test touch pin - Touch0 is T0 which is on GPIO 4.
+
+void setup()
+{
+  Serial.begin(115200);
+  delay(1000); // give me time to bring up serial monitor
+  Serial.println("ESP32 Touch Test");
+}
+
+void loop()
+{
+  Serial.println(touchRead(T0));  // get value using T0
+  delay(1000);
+}