Put some stats on the home page

lib/music_library_web/controllers/stats_controller.ex

@@ -0,0 +1,10 @@
+defmodule MusicLibraryWeb.StatsController do
+  use MusicLibraryWeb, :controller
+
+  alias MusicLibrary.Records
+
+  def index(conn, _params) do
+    records_count = Records.count_records()
+    render(conn, :index, records_count: records_count)
+  end
+end