Hi @codingdefined, thanks for the review. 

Yep, it is better to divide the work across multiple commits. Let me just note that I am squash merging my new features as it is shown in this example: [Feature/pgnsyntax (#3)](https://github.com/programarivm/pgn-chess/commit/3e2390e1f315918f915d5b674f7606cb6aa3feae)

Is that okay? :) I'd like to squash merge the branches to keep the history of the project a bit more concise. 

On the other hand, here is the reason behind so many additions. I just added  a few sample PGN files for testing purposes, and those ones contain thousands of lines -- [games-02.pgn](https://github.com/programarivm/pgn-chess/blob/3e2390e1f315918f915d5b674f7606cb6aa3feae/tests/unit/PGN/File/data/games-02.pgn) is an example having 10004 lines.