Add notes on watchtower

advanced/watchtower.md

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+# Watchtower
+
+We haven't fully evaluated Watchtower and give it's not longer actively maintained we aren't sure if it will be 100% supported.
+
+For those interested in giving it a shot:
+
+``` bash
+
+docker run -d \
+  --name watchtower \
+  -v /var/run/docker.sock:/var/run/docker.sock \
+  v2tec/watchtower
+  --debug
+  --interval 43200 # seconds -- 12 hours in this case -- 24 hours = 86400 ; 7 days = 604800
+  --cleanup
+  --label-enable # --label com.centurylinklabs.watchtower.enable=true on containers to watch
+  --notification-email-from
+  --notification-email-to
+  --notification-email-server
+  --notification-email-server-port
+  --notification-email-server-user
+  --notification-email-server-password
+  --notifications-level info
+
+```