Add task category, paper link, and GitHub link to dataset card

This PR improves the dataset card by adding the `task_categories: object-detection` metadata tag, a link to the associated paper, and a link to the GitHub repository. These additions enhance discoverability and provide essential context for users exploring the dataset on the Hugging Face Hub.

README.md

@@ -1,3 +1,14 @@
----
-license: mit
----
+---
+license: mit
+task_categories:
+- object-detection
+tags:
+- methane-detection
+- hyperspectral
+- satellite-imagery
+---
+
+This repository contains two ML-ready datasets, comprising orthorectified and unorthorectified hyperspectral images from the Earth Surface Mineral Dust Source Investigation (EMIT) sensor, for methane detection. This dataset supports the research presented in the paper [Towards Methane Detection Onboard Satellites](https://huggingface.co/papers/2509.00626).
+
+**Paper:** [Towards Methane Detection Onboard Satellites](https://huggingface.co/papers/2509.00626)
+**Code:** https://github.com/spaceml-org/plume-hunter