Librarian Bot: Add base_model information to model

This pull request aims to enrich the metadata of your model by adding [`xlm-roberta-base`](https://huggingface.co./xlm-roberta-base) as a `base_model` field, situated in the `YAML` block of your model's `README.md`.

How did we find this information? We performed a regular expression match on your `README.md` file to determine the connection.

**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 was requested via the [Librarian Bot](https://huggingface.co./librarian-bot) [metadata request service](https://huggingface.co./spaces/librarian-bots/metadata_request_service) by request of [ravikumar1478](https://huggingface.co./ravikumar1478)

README.md

@@ -1,16 +1,17 @@
 ---
+language:
+- en
 license: mit
 tags:
 - generated_from_trainer
-model-index:
-- name: xlm-roberta-base-finetuned-wikitext2
-  results: []
-language:
-- en
 metrics:
 - accuracy
 - code_eval
 pipeline_tag: fill-mask
+base_model: xlm-roberta-base
+model-index:
+- name: xlm-roberta-base-finetuned-wikitext2
+  results: []
 ---
 
 <!-- This model card has been generated automatically according to the information the Trainer had access to. You