Updated README.md and added supporting docs

[NADEE-MJ]

Description

updated readme.md with graphics and more info, added codeowners, code_of_conduct, contributing, and security docs as well as some graphics for the repo

Issue: #20

Checklist

• [ ] CONSIDER adding a unit test if your PR resolves an issue.
• [x] DO ensure code compiles correctly
• [x] DO document new changes in README / documentation, if necessary
• [x] DO keep pull requests small so they can be easily reviewed.
• [ ] DO make sure unit tests pass.
• [x] DO make sure code is linted.
• [ ] DO make sure not to introduce any compiler warnings.
• [x] AVOID making significant changes to the API's overall architecture.

Please check the type of change your PR introduces

• [ ] Bugfix
• [ ] Feature
• [ ] Code style update (formatting, renaming)
• [x] Documentation content changes
• [ ] Other (please describe):