This is a sub-command GIT repository called app1
Implementation module for sub-command app1 is namespace_demo.app1
Note 1: We have namespace_demo.main_app1.py to wrap CLI. We are not overwriting base module namespace_demo.main.
Note 2: main cli is still from base module demo-cli = "namespace_demo.main_app1:cli" so that app1 is available as sub-command