message: explain how to use drush9 rsyn
diff: @@ -33,3 +33,15 @@ and to use them: `drush @lagoon.master ssh`
  ### Update Site Aliases
  If a new environment in Lagoon has been created, you can just run `drush site:alias-convert` to update the site aliases file.
  +
  +### Drush rsync from local to remote environments
  +
  +If you like to sync files from a local to a remote environment you need to pass additional parameters:
  +
  +```
  +drush rsync @self:%files @lagoon.master:%files -- --omit-dir-times --no-perms --no-group --no-owner --chmod=ugo=rwX
  +```
  +
  +This is not necessary if you rsync from a remote to a local environment.
  +
  +Also we're (working with the Drush Maintainers)[https://github.com/drush-ops/drush/issues/3491] to find a way to inject this fully automatically.
  