Add project: mlp (Proper orthogonal descriptors, POD)

[Irratzo]

Project details:

• Project Name: mlp
• Description: "Proper orthogonal descriptors for efficient and accurate interatomic potentials. Paper."
• Github URL: https://github.com/cesmix-mit/mlp
• Category: mlp
• Labels: lang-julia
• License: None
• Package Managers: None

Additional context:

POD descriptor benchmark, as referenced in the corresponding paper https://doi.org/10.1016/j.jcp.2023.112030.

Original publication not linked in README as of 2023-12-03. Repo description not descriptive. Replace with custom description: Paper title plus link to paper.