Librarian Bot: Add base_model metadata to model

This pull request aims to enrich the metadata of your model by adding `base_model` metadata to `YAML` block of your model's `README.md`.

How did we find this information? We use the `mergekit_config.yml` config from [mergekit](https://github.com/cg123/mergekit).

**Why add this?** Enhancing your model's metadata in this way:
- **Boosts Discoverability** - It becomes straightforward to trace the relationships between various models on the Hugging Face Hub.
- **Highlights Impact** - It showcases the contributions and influences different models have within the community.

For a hands-on example of how such metadata can play a pivotal role in mapping model connections, take a look at [librarian-bots/base_model_explorer](https://huggingface.co/spaces/librarian-bots/base_model_explorer).

This PR comes courtesy of [Librarian Bot](https://huggingface.co/librarian-bot). If you have any feedback, queries, or need assistance, please don't hesitate to reach out to [@davanstrien](https://huggingface.co/davanstrien).

README.md

@@ -2,6 +2,12 @@
 license: apache-2.0
 tags:
 - merge
+base_model:
+- mistralai/Mistral-7B-Instruct-v0.2
+- openchat/openchat-3.5-0106
+- OpenPipe/mistral-ft-optimized-1227
+- berkeley-nest/Starling-LM-7B-alpha
+- jan-hq/supermario-v2
 ---
 
 # SuperChat-7B