Hello,
We have documentation on how to do view and see widget's here: https://docs.q2developer.com/guides/frontend_development/widgets.html
Entrypoint documentation is here: https://docs.q2developer.com/guides/frontend_development/additional_entrypoints.html Doing entrypoints for CSR extensions is a bit more complicated as the documentation states. There is an example in the documentation of how to do it.
Hopefully this helps,
Trey