You are using staging server - a separate instance of the ESP Component Registry that allows you to try distribution tools and processes without affecting the real registry.
# Example readme Description of the example.
To create a project from this example, run:
idf.py create-project-from-example "test_component_manager/test_31a980f5-9de6-448f-85e0-2bef8857fa14_example_readme=4.0.19:cmp_ex"