docker-secret: add page (#4933)

pages/common/docker-secret.md

@@ -0,0 +1,24 @@
+# docker secret
+
+> Manage Docker swarm secrets.
+> More information: <https://docs.docker.com/engine/reference/commandline/secret/>.
+
+- Create a new secret from stdin:
+
+`{{command}} | docker secret create {{secret_name}} -`
+
+- Create a new secret from a file:
+
+`docker secret create {{secret_name}} {{path/to/file}}`
+
+- List all secrets:
+
+`docker secret ls`
+
+- Display detailed information on one or multiple secrets in a human friendly format:
+
+`docker secret inspect --pretty {{secret_name1 secret_name2 ...}}`
+
+- Remove one or more secrets:
+
+`docker secret rm {{secret_name1 secret_name2 ...}}`