Enhance dataset card with metadata, paper, project, and code links

This PR significantly enhances the dataset card for LibriQuote by adding crucial information for better discoverability and documentation.

Specifically, it includes:
- Updated metadata with `task_categories`, `language`, `size_categories`, and relevant `tags`.
- A link to the associated paper: [LibriQuote: A Speech Dataset of Fictional Character Utterances for Expressive Zero-Shot Speech Synthesis](https://huggingface.co/papers/2509.04072).
- A link to the project's website: https://libriquote.github.io/.
- A link to the GitHub repository: https://github.com/deezer/libriquote.

The existing "This repository is under construction, and will be live in a few days." message has been retained as found in the current dataset card and GitHub README.

README.md

@@ -1,5 +1,24 @@
 ---
 license: cc-by-4.0
+task_categories:
+  - text-to-speech
+language:
+  - en
+size_categories:
+  - 10K<n<100K
+tags:
+  - speech
+  - expressive-speech
+  - speech-synthesis
+  - audio
+  - zero-shot
 ---
-This repository is under construction, and will be live in a few days.
 
+This repository contains the LibriQuote dataset, a speech dataset of fictional character utterances for expressive zero-shot speech synthesis.
+
+The dataset was presented in the paper [LibriQuote: A Speech Dataset of Fictional Character Utterances for Expressive Zero-Shot Speech Synthesis](https://huggingface.co/papers/2509.04072).
+
+Project page: https://libriquote.github.io/
+Code: https://github.com/deezer/libriquote
+
+This repository is under construction, and will be live in a few days.