[DOCS] - Better Subdirectory Documentation, Templates

[JLefebvre55]

READMEs and other docs for each of the major subdirectories would make navigation and understanding easier. In addition, adding structural templates for each subsystem would be useful.

Context

Currently tough to get around, and is probably not as good an open-source project as it could be.

• READMEs - What is this folder? What does it contain? What's it's structural pattern?
  • Documentation /docs/
  • Deliverables /deliverables/
• Subsystem Template - matches root structure
  • Hardware hardware/
  • Software software/
  • README - Structure matches functional components of base README, plus:
    • Function (purpose, integration)
    • Implementation (assembly, installation)
    • Testing (protocols, proof of validation)
• #65

Additional context
This will eventually be adapted to our wikis (I think?)