Create ./fr/lessons/basics/documentation.md (#1632)
Create ./fr/lessons/basics/documentation.md (#1632)

Translation and adaptation of the lesson on Elixir documentation into French.
doomspork/elixir-school,doomspork/elixir_school,doomspork/elixir-school,nscyclone/elixir-school,doomspork/elixir_school,nscyclone/elixir-school,doomspork/elixir-school,nscyclone/elixir-school,nscyclone/elixir-school,doomspork/elixir_school