Update file_chooser.ex w/ placeholders

lib/playwright/page/file_chooser.ex

@@ -1,3 +1,16 @@
-defmodule Playwright.Page.FileChooser do
+defmodule Playwright.FileChooser do
   @moduledoc false
+
+  # @spec element(t()) :: ElementHandle.t()
+  # def element(file_chooser)
+
+  # @spec is_multiple(t()) :: boolean()
+  # def is_multiple(file_chooser)
+
+  # @spec page(t()) :: Page.t()
+  # def page(file_chooser)
+
+  # @spec set_files(t(), any(), options()) :: :ok
+  # def cancel(file_chooser, files, options \\ %{})
+
 end