Add ability to list users

lib/mobilizon_web/resolvers/user.ex

@@ -24,6 +24,20 @@ defmodule MobilizonWeb.Resolvers.User do
     {:error, "You need to be logged-in to view current user"}
   end
 
+  @doc """
+  List instance users
+  """
+  def list_and_count_users(
+        _parent,
+        %{page: page, limit: limit, sort: sort, direction: direction},
+        _resolution
+      ) do
+    total = Task.async(&Actors.count_users/0)
+    elements = Task.async(fn -> Actors.list_users(page, limit, sort, direction) end)
+
+    {:ok, %{total: Task.await(total), elements: Task.await(elements)}}
+  end
+
   @doc """
   Login an user. Returns a token and the user
   """