Update README.md

Added dataset description

README.md

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-license: apache-2.0
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+---
+license: apache-2.0
+tags:
+- 3D
+- Gaussian
+---
+
+3D Segmentation HQ Dataset
+
+The 3D Segmentation HQ dataset is a curated collection of 5 real-world scenes with high-quality object segmentation masks designed for research in 3D scene understanding, editing, and rendering.
+This dataset improves upon existing benchmarks by providing cleaner and more consistent object masks across multiple views, enabling reliable evaluation and training for tasks such as:
+- 3D semantic segmentation
+- Object-level scene editing (e.g., removal, recolorization)
+- 3D Gaussian Splatting with semantic supervision
+
+------------------------------------------
+Dataset Composition
+Total Scenes: 5 real-world scenes
+
+Source Datasets:
+
+3 scenes are adapted from the LERF dataset (https://arxiv.org/abs/2303.09553)
+
+2 scenes are adapted from the LLFF dataset (https://huggingface.co/datasets/nerfbaselines/nerfbaselines-data)
+
+Each scene is re-processed with HQ object segmentation masks to ensure multi-view consistency, reducing the noise and inconsistencies commonly found in previous datasets.