Add config.yaml files generation and update readme with folders structure info

README.md

controller/Orchestrator.py

controller/test_Orchestrator.py

icgparser/DomlParserUtilities.py

input_file_generated/ir.json

output_files_generated/nginx_openstack/config.yaml

output_files_generated/nginx_openstack/terraform/main.tf

plugin/TerraformPlugin.py

templates/terraform/open_stack/init.tpl