implement creation of link on first step in backend

lib/entendu_web/views/link_view.ex

@@ -1,3 +1,22 @@
 defmodule EntenduWeb.LinkView do
   use EntenduWeb, :view
+  alias EntenduWeb.LinkView
+
+  def render("show_authorized.json", %{link: link}) do
+    %{
+      id: link.id,
+      burn_after_reading: link.burn_after_reading,
+      expires: link.expires,
+      filename: link.filename,
+      filetype: link.filetype,
+      text_content: link.text_content,
+      file_content: link.file_content
+    }
+  end
+
+  def render("show_unauthorized.json", %{link: link}) do
+    %{
+      id: link.id
+    }
+  end
 end