Update readme add section to DO spaces

Readme.md

@@ -6,6 +6,9 @@ This is a custom elasticsearch image with the elastic image as a base and the s3
 docker build --build-arg elasticsearch_version=7.9.3
 ```
 
+## Spaces the S3 in Digital Ocean
+To save a snapshot we use spaces (S* from Digital Ocean). Log in to your DO-Dashboard and create a new space. Go to the space setting and disable listening of the directory for anonymous users. Under the API menuitem you can create a new access and secret key for your spaces. This key is necessary to create the backup.
+
 ## Snapshot key
 We use keystore to store s3 key and secrete as [recommended by elastic](https://github.com/elastic/helm-charts/blob/master/elasticsearch/README.md#how-to-use-the-keystore). Check the deployment of the es-cluster to see how we use the secrets.