Adding a simple button thingy

arduino/SimpleButton/Makefile

@@ -0,0 +1 @@
+../arduino.mk

arduino/SimpleButton/SimpleButton.ino

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+const unsigned int BUTTON_PIN = 7;
+const unsigned int LED_PIN = 13;
+
+void setup() {
+    pinMode(LED_PIN, OUTPUT);
+    pinMode(BUTTON_PIN, INPUT);
+}
+
+void loop() {
+    const int BUTTON_STATE = digitalRead(BUTTON_PIN);
+
+    if (BUTTON_STATE == HIGH) {
+        digitalWrite(LED_PIN, HIGH);
+    } else {
+        digitalWrite(LED_PIN, LOW);
+    }
+}