Add --fit and --margin parameters

[Belval]

Fixes: #49

[codecov-io]

Codecov Report

Merging #51 into master will increase coverage by 0.39%.
The diff coverage is 91.3%.

@@            Coverage Diff             @@
##           master      #51      +/-   ##
==========================================
+ Coverage   65.53%   65.92%   +0.39%     
==========================================
  Files           6        6              
  Lines         354      361       +7     
==========================================
+ Hits          232      238       +6     
- Misses        122      123       +1

Impacted Files	Coverage Δ
...gnitionDataGenerator/handwritten_text_generator.py	18.26% <ø> (ø)	⬆️
...ecognitionDataGenerator/computer_text_generator.py	97.61% <87.5%> (-2.39%)	⬇️
TextRecognitionDataGenerator/data_generator.py	75.75% <93.33%> (+1.15%)	⬆️

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