Create flow graphs

[JasonPuglisi]

Acceptance Criteria

1. Flow graphs are created according to the Unified Modeling Language (UML) (see link in resources)
2. Flow graphs are stored in the directory /docs/flow-graphs/
3. Flow graphs are well-defined for each application component

Resources:

• Flow graphs (activity diagrams) guide: https://www.uml-diagrams.org/activity-diagrams.html