[Internal] [Feature] Update README with more detail on parameters

[jessicarowell]

We've added some parameters to the config files (e.g., metadata validation params) so it's time to update the README with a more in-depth portion that discusses all the options.

Place an ❌ in a Box that Best Matches the Feature's Importance:

• [] 1 - Most important (absolutely integral and will not use codebase at all without it)
• [] 2-4 - Moderate (still using codebase for other functions but is serving as a blocker for future use-cases)
• 5 - Least important (would like to see but there are no stringent expectations nor urgency for current/future use-cases) 

Any Additional Context or Information? Has There Been Any Progress Made So Far Towards this Request? Any Helpful Resources to Reference? Screenshots or Links?