Remove Side argument of Board::setKing
Remove useless throw in Board::readPositions
Use UTF-8 in README.md
Improve README.md
Make highlighting prettier
Use HSL for colors
Add menus and actions for history and game with sortcuts
Remove Window::keyPressEvent
Rename Window labels_ to tiles_

Add Readme.md file
Make gameMode a constexpr
Put TooManyKingsException in backend