Add Newsie to documented clients

docs/en/040_Compatible_Clients.md

@@ -224,6 +224,16 @@ The Arsse does not at this time have any first party clients. However, because T
     <p></p>
    </td>
   </tr>
+  <tr>
+   <td><a href="https://open-store.io/app/newsie.martinferretti">Newsie</a></td>
+   <td>Ubuntu Touch</td>
+   <td class="Y">✔</td>
+   <td class="N">✘</td>
+   <td class="N">✘</td>
+   <td>
+    <p>Does not support HTTP authentication.</p>
+   </td>
+  </tr>
   <tr>
    <td><a href="https://apps.apple.com/app/id588726889">ReadKit</a></td>
    <td>macOS</td>