Notebook on cations on 2D perovskites

[Pepe-Marquez]

Draft a notebook that leverages the new ions data for data analysis and machine learning tasks. Some ideas on the structure:

• Add a folder for storing example notebooks
• Add docs for how to run the notebooks
  • Add them in example uploads entry points.
• API call to retrieve the data. First filter would be 2D perovskites but we can combine more.
• Mosaic of all the organic cations used. Use rdkit for that and maybe nglview in a tiny widget app
• Derive geometric features of the molecules and check if they have any correlation with materials properties like bandgap.
  ...

Ideally, find new molecules that target a new property. For example, give me a new cation that will produce a PbI3 based perovskite for a bandgap of 1.9 eV.