* Create RFC for ML Model
* Add ml model graph file
* add link to graph
* Add high level design for ML model
* ai->ml
* Rename 000-ml_models.md to README.md
* Add link to RFC PR
* Update README.md
* address some comments
* Delete ml_model_graph.png
* add ML Model graph
* Address reviewer comments
* Address more comments
* Update README.md
* Rename docs/rfc/active/000-ml_models/README.md to docs/rfc/active/1812-ml_models/README.md
* Delete high_level_design.png
* Delete ml_model_graph.png
* Add files via upload
Co-authored-by: Mars Lan <mars.th.lan@gmail.com>