add multithread game logic. add tests. edit cmake

main.cpp

@@ -1,13 +1,14 @@
 #include "include/Game.h"
+#include <exception>
 #include <iostream>
 
 int main () {
     try {
         Game game;
         game.run();
+        return 0;
     } catch ( const std::exception &e ) {
         std::cerr << "Fatal Error: " << e.what() << "\n";
         return 1;
     }
-    return 0;
 }