Added Elixir file example

tests/syntax-tests/source/Elixir/LICENSE.md

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+MIT License
+
+Copyright (c) 2020 José Eduardo
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

tests/syntax-tests/source/Elixir/command.ex

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+defmodule Charlex.Command do
+  @callback usage() :: [String.t()]
+
+  @callback description() :: String.t()
+
+  @callback parse_args(args :: String.t()) :: any()
+
+  @callback run(context :: Map.t(), args :: [String.t()] | any()) :: String.t() | any()
+
+  @optional_callbacks usage: 0, description: 0, parse_args: 1
+
+  defmacro __using__(_opts) do
+    quote do
+      @behaviour unquote(__MODULE__)
+
+      @impl true
+      def usage, do: "This command is without usage, will add it soon"
+
+      @impl true
+      def description, do: "This command is without description, will add it soon"
+
+      @impl true
+      def run(_context, _args), do: :ok
+
+      @impl true
+      def parse_args(args), do: args |> String.split() |> Kernel.tl()
+
+      defoverridable parse_args: 1, description: 0, run: 2, usage: 0
+    end
+  end
+end