Add hyphenation and a generalized render_public_content function

lib/outlook/hyphenation.ex

@@ -0,0 +1,31 @@
+defmodule Outlook.Hyphenation do
+
+  def hyphenate(html, lang) do
+    form = get_multipart_form(
+      [
+        {"api-token", System.get_env("HYPH_API_TOKEN")},
+        {"hyph[lang]", String.downcase(lang)},
+        {"hyph[text]", html},
+      ]
+    )
+
+    response_raw = HTTPoison.request!(
+      :post,
+      System.get_env("HYPH_URL"),
+      form,
+      get_multipart_headers()
+    )
+    response_raw.body
+  end
+
+  defp get_multipart_form fields do
+    {:multipart, fields}
+  end
+
+  defp get_multipart_headers() do
+   [
+    "Content-Type": "multipart/form-data",
+    "Transfer-Encoding": "chunked",
+   ]
+  end
+end