Human Liver Cytosolic Stability codes

[paulinebanye]

Steps taken

• [x] Modification of the codebase
• [x] Addition of the .pkl files for the model
• [x] Edit of the README.md
• [x] Update of the metadata.json

[GemmaTuron]

Hi @pauline-banye

I have had to revert the PR because you modified the identifier slug of the model from the original issue: https://github.com/ersilia-os/ersilia/issues/604

Please revert to the original SLUG or the update of metadata fails