chore(model gallery): add finemath-llama-3b

[mudler]

Description

This pull request includes an update to the gallery/index.yaml file, adding a new model entry for finemath-llama-3b. The new entry provides detailed information about the model, its training dataset, performance, and associated files.

Key changes:

• Added a new model entry for finemath-llama-3b with the following details:
  • Icon URL
  • Name and URLs for the model
  • Description of the model, including training dataset and performance metrics
  • Overrides for model parameters
  • File details, including filename, SHA-256 checksum, and URI

Notes for Reviewers

Signed commits

• Yes, I signed my commits.

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