Add s3cmd support status

Fixes #987

README.md

@@ -125,6 +125,13 @@ Listening on http://172.30.2.17:9000
 
 Please follow the documentation here - [Using aws-sdk-go with Minio server](./AWS-SDK-GO.md)
 
+#### How to use s3cmd with Minio?
+<blockquote>
+Even with Signature version '4' enabled, 's3cmd' falls back to Signature version '2' for listing your buckets. Since minio server is only Signature version '4' listing your buckets with Signature version '2' fails. We have no immediate plans on supporting Signature version '2'. Please follow https://github.com/minio/minio/issues/987 to know more on this issue.
+</blockquote>
+
+`s3cmd` is currently not supported.
+
 ## Contribute to Minio Project
 Please follow Minio [Contributor's Guide](./CONTRIBUTING.md)