implemented displaying chess board and pieces with temp assets

assets/temp_assets/white_bishop.png

assets/temp_assets/white_bishop.png.import

assets/temp_assets/white_king.png

assets/temp_assets/white_king.png.import

assets/temp_assets/white_knight.png

assets/temp_assets/white_knight.png.import

assets/temp_assets/white_pawn.png

assets/temp_assets/white_pawn.png.import

assets/temp_assets/white_queen.png

assets/temp_assets/white_queen.png.import

assets/temp_assets/white_rook.png

assets/temp_assets/white_rook.png.import

game.tscn

project.godot

scenes/board.tscn

scenes/texture_holder.tscn

scripts/board.gd