Update README.md

Author: Beelink

README.md

@@ -8,6 +8,9 @@
   <a href="https://github.com/ModuleArt/quick-picture-viewer/releases">
     <img alt="GitHub release (latest by date including pre-releases)" src="https://img.shields.io/github/v/release/moduleart/quick-library?include_prereleases">
   </a>
+  <a alt="Trello roadmap" href="https://trello.com/b/uLrm7vEH/quick-library">
+    <img src="https://img.shields.io/badge/planner-trello-%230079BF">
+  </a>
   <a alt="Buy ma a coffee" href="https://www.patreon.com/moduleart">
     <img alt="Patreon" src="https://img.shields.io/badge/donate-patreon-%23E85B46">
   </a>