Add examples for disjoint? and subset?
Add examples for disjoint? and subset?

kimshrier/elixir,kimshrier/elixir,ggcampinho/elixir,ggcampinho/elixir,michalmuskala/elixir,antipax/elixir,elixir-lang/elixir,gfvcastro/elixir,pedrosnk/elixir,gfvcastro/elixir,pedrosnk/elixir,kelvinst/elixir,lexmag/elixir,antipax/elixir,kelvinst/elixir,beedub/elixir,lexmag/elixir,beedub/elixir,joshprice/elixir