Added more comments.

src/eventReceiver.cpp

@@ -1,18 +1,23 @@
 #include "eventReceiver.h"
 
+// Initialize
 EventReceiver::EventReceiver() {
+	// Set all keys to false, because none of them are pressed
 	for(u32 i = 0; i < KEY_KEY_CODES_COUNT; i++) {
 		KeyIsDown[i] = false;
 	}
 }
 
 bool EventReceiver::OnEvent(const SEvent &event) {
+	// If the input event is a key press
 	if(event.EventType == irr::EET_KEY_INPUT_EVENT) {
+		// Set our keyIsDown variable to the event one
 		KeyIsDown[event.KeyInput.Key] = event.KeyInput.PressedDown;
 	}
 	return false;
 }
 
 const bool EventReceiver::IsKeyDown(EKEY_CODE keyCode) {
+	// Return if the key is down
 	return KeyIsDown[keyCode];
 }