CRNN Module (implemented with VGG16)

[charlesmindee]

This PR implements Abstract RecognitionModel class, with a child : CRNN model implemented with a VGG16.

[codecov]

Codecov Report

Merging #35 (3b6ce58) into main (90aee92) will decrease coverage by 0.09%.
The diff coverage is 97.22%.

@@            Coverage Diff             @@
##             main      #35      +/-   ##
==========================================
- Coverage   98.22%   98.12%   -0.10%     
==========================================
  Files          15       17       +2     
  Lines         338      374      +36     
==========================================
+ Hits          332      367      +35     
- Misses          6        7       +1     

Impacted Files	Coverage Δ
doctr/models/recognition/model.py	90.00% <90.00%> (ø)
doctr/models/recognition/__init__.py	100.00% <100.00%> (ø)
doctr/models/recognition/crnn.py	100.00% <100.00%> (ø)

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[fg-mindee]

Thanks for the PR! Just a few things to correct, but this looks really good!

[fg-mindee]

Looks good to me!