Create Optimism-doc.md

[NhlanhlaHasane]

The following items should be included as headers in the markdown document (##).

This is the MIN information required, and you are encouraged to include as much information as you can track down.

Please include links to

• Type:

• Transaction cost:

• Finality

• Consensus:

• Capital Efficiency:

• Max TPS:

• Additional info:

• Social media and community links:

Reviewer checklist

• The code follows the guidelines outlined in the Contribution Guide

Developer checklist

• Please provide proof of participation within the service/project you are updating
• The code follows the guidelines outlined in the Contribution Guide