Add API

[bhirsz]

Closes #49

[codecov-commenter]

Codecov Report

Merging #99 (5701e96) into main (3fec199) will increase coverage by 0.02%.
The diff coverage is 96.00%.

@@            Coverage Diff             @@
##             main      #99      +/-   ##
==========================================
+ Coverage   96.87%   96.90%   +0.02%     
==========================================
  Files          21       22       +1     
  Lines         961     1000      +39     
==========================================
+ Hits          931      969      +38     
- Misses         30       31       +1     

Impacted Files	Coverage Δ
robotidy/api.py	94.73% <94.73%> (ø)
robotidy/app.py	90.36% <95.23%> (+2.36%)	⬆️
robotidy/cli.py	94.95% <100.00%> (+0.75%)	⬆️
robotidy/transformers/__init__.py	100.00% <100.00%> (ø)

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