update readme to reflect new changes

[yemeen]

Pull Request

Summary

make readme reflect 1.0 changes

Description

rewrote to mention classes directly and change 2d/3d to any dimension. added quick start section.

Motivation and Context

for joss

How has this been tested?

n/a

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ x ] Documentation update
• Code refactoring
• Performance improvement
• Test improvement

Checklist

• [ x ] My code follows the code style of this project. (make clean)
• I have incremented the version number in the pyproject.toml file (if applicable).
• I have added tests to cover my changes (if applicable).
• All new and existing tests passed. (make tests)
• [ x ] I have updated the documentation (if applicable).
• My changes generate no new warnings.
• I have added any necessary new dependencies to pyproject.toml.

Additional Notes

Screenshots (if applicable)