make base game checkers gameplay

pick a theme between 2 choice, then Change the theme color according to the choice when playing

Player and opponent will change turn every 1 move , not present in #2

create a UI for the switching turn Button, and then add a marker to indicate the current player turn, still not present in #4

add king move and piece, every piece that reaches to the end of the opponent's board

need structuring project for game mode, so from main menu, player can choose and play some different game mode that have different mechanism. add game mode choose mechanism

adding vs computer mechanism, then connect to the main menu

create a bot algorithm, so that when the turn after the player, the enemy will immediately move according to the algorithm, and return to the player's turn

Constructing better ui for game result panel

• the player has not made a move, but has changed the order, (must restrict)
• after kill move, players can only move the same pieces during the kill move (must restrict)

not urgent

every piece that is dragged to the end of the opponent's board will automatically turn into a king, need to fix condition for changeToKing