Aktualisieren von README.md

Author: l4rm4nd

examples/excalidraw/README.md

@@ -1,3 +1,10 @@
 # References
 
-- https://github.com/excalidraw/excalidraw
+- https://github.com/excalidraw/excalidraw
+
+# Notes
+
+Collaboration is not yet supported natively. You would have to also host an Excalidraw collaboration room:
+
+- https://github.com/excalidraw/excalidraw-room
+- https://github.com/excalidraw/excalidraw/issues/4993#issuecomment-1783669768