new: [bitwarden] added an example.

compose.yml

@@ -106,3 +106,13 @@ letsencrypt:
 #       postgres:
 #         user: mattermost
 #         dbname: mattermost
+
+# bitwarden:
+#  relations:
+#    web-proxy:
+#      frontend:
+#        domain: bitwarden.mydomain.com
+#        ## We need to specify here the port as it can't be infered easily as
+#        ## there are 2 ports exposed by the image.
+#        target: bitwarden:80
+#        ssl: letsencrypt