mix new app (create new elixir project "app") for #663

.formatter.exs

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+# Used by "mix format"
+[
+  inputs: ["{mix,.formatter}.exs", "{config,lib,test}/**/*.{ex,exs}"]
+]

config/config.exs

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+# This file is responsible for configuring your application
+# and its dependencies with the aid of the Mix.Config module.
+use Mix.Config
+
+# This configuration is loaded before any dependency and is restricted
+# to this project. If another project depends on this project, this
+# file won't be loaded nor affect the parent project. For this reason,
+# if you want to provide default values for your application for
+# 3rd-party users, it should be done in your "mix.exs" file.
+
+# You can configure your application as:
+#
+#     config :app, key: :value
+#
+# and access this configuration in your application as:
+#
+#     Application.get_env(:app, :key)
+#
+# You can also configure a 3rd-party app:
+#
+#     config :logger, level: :info
+#
+
+# It is also possible to import configuration files, relative to this
+# directory. For example, you can emulate configuration per environment
+# by uncommenting the line below and defining dev.exs, test.exs and such.
+# Configuration from the imported file will override the ones defined
+# here (which is why it is important to import them last).
+#
+#     import_config "#{Mix.env()}.exs"

lib/app.ex

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+defmodule App do
+  @moduledoc """
+  Documentation for App.
+  """
+
+  @doc """
+  Hello world.
+
+  ## Examples
+
+      iex> App.hello()
+      :world
+
+  """
+  def hello do
+    :world
+  end
+end

mix.exs

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+defmodule App.MixProject do
+  use Mix.Project
+
+  def project do
+    [
+      app: :app,
+      version: "0.1.0",
+      elixir: "~> 1.7",
+      start_permanent: Mix.env() == :prod,
+      deps: deps()
+    ]
+  end
+
+  # Run "mix help compile.app" to learn about applications.
+  def application do
+    [
+      extra_applications: [:logger]
+    ]
+  end
+
+  # Run "mix help deps" to learn about dependencies.
+  defp deps do
+    [
+      # {:dep_from_hexpm, "~> 0.3.0"},
+      # {:dep_from_git, git: "https://github.com/elixir-lang/my_dep.git", tag: "0.1.0"},
+    ]
+  end
+end

test/app_test.exs

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+defmodule AppTest do
+  use ExUnit.Case
+  doctest App
+
+  test "greets the world" do
+    assert App.hello() == :world
+  end
+end

test/test_helper.exs

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+ExUnit.start()