MAGETWO-58729: [Generator] Add images to performance profile generator

Author: AVoskoboinikov

setup/performance-toolkit/README.txt

@@ -85,3 +85,6 @@ Details http://jmeter.apache.org/usermanual/component_reference.html#View_Result
 
 About other types read on
 http://jmeter.apache.org/usermanual/component_reference.html
+
+About fixtures generation
+http://devdocs.magento.com/guides/v2.1/config-guide/cli/config-cli-subcommands-perf-data.html