Starting Multiple External Processes under Supervisor

[MarcusSorealheis]

When leveraging Porcelain.Process(s) under a Supervisor the best way for the processes to be automatically restarted when they crash as "supervised" workers is to call Porcelain.Process.await/2 in callback function body. However, this is not in the documentation and there may not be the place for it since the docs do get at such behavior for Porcelain.Process.await/2.

Perhaps an example of it should be added to the README.md. What do you think?

[MarcusSorealheis]

#34 here is an example