add support for RAM - Resource Access Management

[CloudFoxx]

MindSphere provides policies support to manage what user has access to what asset tree.
CLI should support creation and configuration of policies
more to be found here: https://documentation.mindsphere.io/MindSphere/apis/core-resourceaccessmanagement/api-resourceaccessmanagement-overview.html

[sn0wcat]

the polciies client is there since few versions already.