Add model card and metadata

This PR adds a model card with the appropriate metadata, including the `pipeline_tag`, `library_name`, and `license`. It also includes a brief description of the model and links to the paper and GitHub repository.

README.md

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+---
+pipeline_tag: feature-extraction
+library_name: transformers
+license: mit
+---
+
+# VenusFactory: A Unified Platform for Protein Engineering Data Retrieval and Language Model Fine-Tuning
+
+This repository provides the tokenizer used in the VenusFactory platform, described in [VenusFactory: A Unified Platform for Protein Engineering Data Retrieval and Language Model Fine-Tuning](https://huggingface.co/papers/2503.15438). VenusFactory is a unified platform for protein engineering that integrates data retrieval, standardized task benchmarking, and modular fine-tuning of protein language models (PLMs).
+
+Code and further details are available at: https://github.com/tyang816/VenusFactory