[Feature Add] Put a title to the pdf

[hjeonee]

A option to put a title to the pdf, like the fle name, will be great.

I usually print multiple files(somtimes an entire project), and sometimes it gets mixed up.

[tushar-rishav]

@hjeonee Thanks for the wonderful suggestion! Unfortunately, I do not have time to work on it at this moment. :( If you have spare cycles, I will highly appreciate a pull request from you implementing this feature. :)