chore: add doc for external volume

README.md

@@ -22,3 +22,17 @@
 * `abra app deploy <app-name>`
 
 For more, see [`docs.coopcloud.tech`](https://docs.coopcloud.tech).
+
+
+## Volume
+
+You can manually create a volume that has more storage for the library. For example samba: https://docs.docker.com/engine/storage/volumes/#create-cifssamba-volumes
+
+```
+ docker volume create \
+	--driver local \
+	--opt type=cifs \
+	--opt device=//uxxxxx.your-server.de/backup \
+	--opt o=addr=uxxxxx.your-server.de,username=uxxxxxxx,password=*****,file_mode=0777,dir_mode=0777 \
+	--name immich_example_com_uploads
+```