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This patch documents the basic usage of `Client` instances. It does not provide a detailed documentation about the methods exposed but a high level documentation of what the recommended way to access these resources is. The current version refers to sections like 'core API', 'config' and others that haven't been documented yet. Once they will be, proper links to those sections will be added here. Change-Id: I705498b8e4c19c75c9697419d1fd90c9a9ae40b9