new: [ftp] added an example.

compose.yml

@@ -86,3 +86,18 @@ logrotate:
 
 # bitwarden.mydomain.org:
 #   charm: bitwarden
+
+
+# ftp.mydomain.org:
+#   charm: vsftp
+#   options:
+#     #domain: ftp.mydomain.org   ## set domain if service name is not already a domain
+#     #ssl: false    ## deactivate ssl (activated if letsencrypt available)
+#     #pasv: false   ## deactivate pasv (activated if domain found)
+#     users:
+#       foo:
+#         password: bar
+#         groups:
+#           - my_group
+#       wiz:
+#         uid: 3000