Add publiccode.yml metadata file

[libremente]

List of Changes

This PR:

• adds a publiccode.yml metadata file to the repository.

Motivation and Context

Our internal policy requires to have a publiccode.yml file for each public FOSS repo.

How Has This Been Tested?

Screenshots (if appropriate):

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.

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Latest commit: 50370e6

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