A Charm's life intro to charm events

Juju intro graph
https://drive.google.com/file/d/1llwprw_7a_Oj_TsUNGZMGq__YC2v-PFR/view?usp=sharing

A charm's life doc
https://discourse.charmhub.io/t/a-charms-life/5938

A charm's life graph source
https://github.com/PietroPasotti/charm-events

A charm's life simulator
https://github.com/PietroPasotti/charm-events/blob/main/simulator.py

Unit and Workload statuses reference
https://discourse.charmhub.io/t/unit-and-workload-statuses-reference-doc/5800