Introduce group basic federation, event new page and notifications

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

lib/mix/tasks/mobilizon/groups.ex

@@ -0,0 +1,17 @@
+defmodule Mix.Tasks.Mobilizon.Groups do
+  @moduledoc """
+  Tasks to manage groups
+  """
+
+  use Mix.Task
+
+  alias Mix.Tasks
+
+  @shortdoc "Manages Mobilizon groups"
+
+  @impl Mix.Task
+  def run(_) do
+    Mix.shell().info("\nAvailable tasks:")
+    Tasks.Help.run(["--search", "mobilizon.groups."])
+  end
+end