Documentation: Update README.md

[favillat]

Description

Currently README is outdated and unhelpful for new members/ anyone who hasn't interacted with Dashboard.

• Add concise yet informative intro section.
• Add "getting started" section.
  • walks through front end setup.
  • walks through backend API set up.
• Added Contacts section, @favillat for example.
• Add a "building" section
  • walk through compiling project.
  • running said production app.