Add StreamData lesson (#1671)
Add StreamData lesson (#1671)

* Add StreamData lesson

* Address PR comments

nscyclone/elixir-school,nscyclone/elixir-school,doomspork/elixir-school,doomspork/elixir_school,doomspork/elixir_school,doomspork/elixir_school,doomspork/elixir-school,doomspork/elixir-school,nscyclone/elixir-school,nscyclone/elixir-school