Added reading pgn library from binary

[nurmukhametdaniyar]

Hey

I started using this library and encountered the problem where I need to read from buffer instead of reading from a file, so I added a small function to read from buffer

Hope it helps

[nurmukhametdaniyar]

I was also able to avoid issue #24 after using reading from the buffer

[jmagnuson]

Thanks, I like this idea. I wonder if there's a way to generalize it to take a iterator of bytes, maybe using something like Bytes or something compatible with nom? That should help more constrained systems which might not have the ability to buffer the entire dbc. I'll take a look soon if someone doesn't beat me to it.

[codecov]

Codecov Report

Merging #30 (2d71923) into master (116c4cd) will decrease coverage by 1.78%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master      #30      +/-   ##
==========================================
- Coverage   68.88%   67.09%   -1.79%     
==========================================
  Files           5        5              
  Lines         601      617      +16     
==========================================
  Hits          414      414              
- Misses        187      203      +16     

Impacted Files	Coverage Δ
src/pgn.rs	62.89% <0.00%> (-3.34%)	⬇️

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