Missing documentation

Documentations are missing for the following algorithms:

linear_machine_learning_and_comparison
facenet_project_and_comparison
mnist_tester

A short description in the corresponding .json description would also be good.

There's no need for a full paper about them but documenting what they do and their purpose will allow to generate the appropriate information for the AI4EU Acumos platform as well as make them visible on the BEAT platform.

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