After 'mix phx.new generic_rest_server --binary-id --no-install'

lib/generic_rest_server.ex

@@ -0,0 +1,9 @@
+defmodule GenericRestServer do
+  @moduledoc """
+  GenericRestServer keeps the contexts that define your domain
+  and business logic.
+
+  Contexts are also responsible for managing your data, regardless
+  if it comes from the database, an external API or others.
+  """
+end