Add license note

include/EventConnection.h

@@ -1,3 +1,10 @@
+/// @file        EventConnection.hpp
+/// @description Callback handler for event connections
+/// @author      Josh O'Leary - Redacted Software
+/// @revision    3
+/// @lastedit    2024-02-21
+/// @license     Unlicense - Public Domain
+
 #pragma once
 
 #include <functional>