elixir_003: Mix

mix_new.sh

mix new project_name

# * creating README.md
# * creating .gitignore
# * creating mix.exs
# * creating config
# * creating config/config.exs
# * creating lib
# * creating lib/project_name.ex
# * creating test
# * creating test/test_helper.exs
# * creating test/project_name_test.exs
#
# Your mix project was created successfully.
# You can use mix to compile it, test it, and more:
#
#     cd project_name
#     mix test
#
# Run `mix help` for more commands.