Add christmas edition

christmas/AdAstra/src/mediator/mediator.h

@@ -0,0 +1,23 @@
+#ifndef MEDIATOR_H
+#define MEDIATOR_H
+
+#include <avr/io.h>
+
+
+// Setup the drivers, and business layer objects and their relations
+// It is kind of a very basic dependency injection.
+void setupConnections();
+
+// Start drawing frames and ticking objects
+void startGame();
+
+// Make the machine go to sleep
+void handleOff();
+
+// Increase or decrease the contrast (brightness) of the display
+// by the given value
+// The contrast can be any number between 0 and 255.
+// The function automatically clamps the contrast.
+void changeDisplayContrast(int8_t by);
+
+#endif