Curve doc

[alirezazolanvari]

What does this implement/fix? Explain your changes.

• ROCCurve and PRCurve sections are added to README.md and Document
• Minor bugs fixed in pycm_curve.py

[codecov-commenter]

Codecov Report

Merging #469 (c6e7346) into dev (14710fc) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##              dev     #469   +/-   ##
=======================================
  Coverage   99.13%   99.13%           
=======================================
  Files          12       12           
  Lines        2629     2629           
  Branches      430      430           
=======================================
  Hits         2606     2606           
  Misses          9        9           
  Partials       14       14           

Impacted Files	Coverage Δ
pycm/pycm_curve.py	97.03% <100.00%> (ø)

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[sepandhaghighi]

@sadrasabouri Please re-review this PR. If everything is okay, Squash/Merge it after approval 🚀