chore(model gallery): add medgemma-27b-text-it

[mudler]

Description

This pull request adds a new entry for the MedGemma 27B text-only model to the gallery/index.yaml file. The update includes detailed metadata and descriptions for the model, as well as file-specific information for its usage.

Addition of MedGemma 27B model:

• New model entry: Added medgemma-27b-text-it, a text-only variant of the MedGemma collection, optimized for medical text comprehension and inference-time computation. The entry includes:
  • Description of the model's purpose, training data, and intended use.
  • Links to the model's resources on Hugging Face.
  • File metadata, including filename, SHA256 hash, and URI for downloading the model file.

Notes for Reviewers

Signed commits

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