Docs/update readme

[francescopisu]

Update README with two graphical examples:

• multiple models being compared in terms of areas-under-curve in the average ROC plot;
• both visual and quantitative calibration evaluation of the best performing model with observed vs. predicted plot

#10

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (77d168d) 88.23% compared to head (fcbb9a0) 88.23%.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev      #11   +/-   ##
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  Coverage   88.23%   88.23%           
=======================================
  Files           9        9           
  Lines         323      323           
=======================================
  Hits          285      285           
  Misses         38       38           

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