Librarian Bot: Add base_model information to model

This is a pull request to add `facebook/convnext-base-224-22k` as a `base_model` field to the metadata for your model (defined in the `YAML` block of your model's `README.md`).
This information was found in the model card by doing a regular expression match on your model's `README.md` file.
Adding this information to your models metadata will allow users to find your model when searching for models based on a specific model and make it easier to discover the links between different models on the hub.

This PR was made by Librarian Bot. Feel free to get in touch with

@davanstrien
](https://huggingface.co/davanstrien) with feedback or questions.

README.md

@@ -5,6 +5,7 @@ tags:
 - generated_from_trainer
 metrics:
 - f1
+base_model: facebook/convnext-base-224-22k
 model-index:
 - name: convnext_manuscript_iiif
   results: []