added new library function: get_board_after_move

engine/src/lib.rs

@@ -16,4 +16,9 @@ pub fn get_available_moves(fen: &str) -> Vec<ChessMove> {
 pub fn is_game_over(fen: &str) -> Option<GameEnd> {
   println!("is_game_over answered");
   return None;
+}
+
+pub fn get_board_after_move(fen: &str, chess_move: &ChessMove) -> String {
+  println!("get_board_after_move answered");
+  return String::from("rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1");
 }