Update README

[justemoilouise]

Description

• updates the list of what's already existing and what is still left to do

[codecov-commenter]

Codecov Report

Merging #132 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #132   +/-   ##
=======================================
  Coverage   99.66%   99.66%           
=======================================
  Files          39       39           
  Lines         602      602           
  Branches       88       88           
=======================================
  Hits          600      600           
  Misses          2        2           

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