Initial commit for LED in GIO2

Readme.md

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+# Readme
+
+for ESP32-S led blinking and serial communication

blinking-led.ino

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+/*
+  ESP 32 Blink
+  Turns on an LED on for one second, then off for one second, repeatedly.
+  The ESP32 has an internal blue LED at D2 (GPIO 02)
+*/
+
+// int LED_BUILTIN = 02;  // this var is defined in pins_arduino.h for  DOIT ESP32 DEVKIT V1
+
+void setup() 
+{
+  // this code run only once:
+  pinMode(LED_BUILTIN, OUTPUT);
+
+  //serial monitor setup
+  Serial.begin(115200);
+}
+
+void loop() 
+{
+  Serial.print("Hello");
+  digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)
+  delay(250);                         // wait for 0.250 seconds
+
+  Serial.print(" World!!\n");
+  digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW
+  delay(250);                       // wait for 0.250 seconds
+}