Resolve "Documentation debt"

What does this MR do?

Adds more information to the README, and documents all the C++ classes and its methods.

Is there something that needs to be double checked?

I don't think so

Can this MR be accepted?

• Implemented
  • Updated README
  • C++ classes documented
  • Move and rename c++ headers
• Pipelines passing
  • 
  • 
  • 
• Delete branch option set
• Added entry to CHANGELOG.md

Related issues

Closes #18 (closed)