Add Feel++ package metadata and update mapping references

[prudhomm]

• closes add feelpp codemeta #29

[Copilot]

Pull request overview

This PR adds Feel++ package metadata to the software catalog by creating a self-assessment document and registering its codemeta.json file in the mapping configuration, addressing issue #29.

Key Changes:

• Creates a comprehensive self-assessment document for Feel++ covering packaging, testing, documentation, and compliance criteria
• Adds Feel++ codemeta.json source URL to the mapping.json configuration file

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
self-assessment/feelpp.md	New self-assessment document detailing Feel++'s compliance with software catalog criteria including packaging availability, CI/CD, licensing, documentation, and performance testing
main-list/mapping.json	Adds Feel++ repository's codemeta.json as a new source entry with proper mapping reference and creation permissions

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