Adding Blinky.ino and README.md

sketches/Blinky/Blinky.ino

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+/*
+  Blinky
+
+Toggles the LED of the Arduino repeatedly on and off.
+
+by Martin Stokroos
+m.stokroos@rug.nl
+*/
+
+#define PIN_LED 13
+
+// the setup function called once after reset
+void setup() {
+  // initialize digital pin connected to the LED as an output.
+  pinMode(PIN_LED, OUTPUT);
+}
+
+// infinite program loop
+void loop() {
+  digitalWrite(PIN_LED, HIGH);   // turn the LED on
+  delay(500);                    // wait for half a second
+  digitalWrite(PIN_LED, LOW);    // turn the LED off
+  delay(500);                    // wait for half a second
+}
+
+// end

sketches/Blinky/README.md

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+# Blinky
+
+Blinky is a simple Arduino sketch that blinks the LED on the Arduino.
+The sketch was created for learning how to create a Git repository.
+