add SFTP service

content/services/minio.md

@@ -62,6 +62,13 @@ Don't use your burble.dn42 username and password.
 Use the web interface on [https://minio.burble.dn42](https://minio.burble.dn42) to create a unique access and secret key when using the S3 API.
 {{</hint>}}
 
+### SFTP
+
+- sftp -P 8022 <username>@minio.burble.dn42
+
+The minio instance can also be accessed via SFTP on port 8022.
+Log in to the SFTP server using your burble.dn42 username (MNTNER name in lowercase) and password.
+
 ## Example usage
 
 ### Using the minio client utility
@@ -103,3 +110,16 @@ $ mkdir tmp
 $ rclone mount burble: tmp
 ```
 
+### Using SFTP
+
+Simply use your burble.dn42 username and password to access the SFTP server on port 8022.
+
+```text
+$ sftp -P 8022 burble@minio.burble.dn42
+burble@minio.burble.dn42's password: 
+Connected to minio.burble.dn42.
+sftp> dir
+burble-images  
+sftp> exit
+```
+