added startup menu

src/Core/GameBoard.cpp

@@ -10,6 +10,7 @@
 #include <memory>
 #include <utility>
 #include <cstdlib>
+#include <iostream>
 
 
 GameBoard::GameBoard(int boardWidth, int boardHeight, const std::shared_ptr<PiecesList>& piecesList, int nextQueueLength) :

src/Core/GameParameters.cpp

@@ -7,7 +7,7 @@
 GameParameters::GameParameters(Gamemode gamemode, const Player& controls) :
     gamemode(gamemode),
     controls(controls) {
-        
+    
     this->reset();
 }