add 00 blink

00_esp_blink/00_esp_blink.ino

@@ -0,0 +1,12 @@
+#define LED_BUILTIN 2
+
+void setup() {
+  pinMode(LED_BUILTIN, OUTPUT);
+}
+
+void loop() {
+  digitalWrite(LED_BUILTIN, HIGH);  
+  delay(1000);                      
+  digitalWrite(LED_BUILTIN, LOW);   
+  delay(1000);                      
+}

00_esp_blink/Blink.txt

@@ -0,0 +1 @@
+Turn an LED on and off.