[pixeldrain] add 'file' and 'album' extractors (#4839)

docs/supportedsites.md

@@ -637,6 +637,12 @@ Consider all sites to be NSFW unless otherwise known.
     <td>All Pins, Created Pins, Pins, pin.it Links, related Pins, Search Results, Sections, User Profiles</td>
     <td><a href="https://github.com/mikf/gallery-dl#cookies">Cookies</a></td>
 </tr>
+<tr>
+    <td>pixeldrain</td>
+    <td>https://pixeldrain.com/</td>
+    <td>Albums, Files</td>
+    <td></td>
+</tr>
 <tr>
     <td>Pixhost</td>
     <td>https://pixhost.to/</td>