Add pipeline tag and library name

This PR adds the `pipeline_tag` and `library_name` to the model card metadata for better searchability and discoverability. The `pipeline_tag` is set to `image-segmentation` as per the model's function. The `library_name` is set to `Pointcept` based on the model architecture described in the README.

README.md

@@ -1,10 +1,12 @@
 ---
-license: mit
+base_model:
+- Pointcept/PointTransformerV3
 datasets:
 - labelmaker/arkit_labelmaker
 - labelmaker/ALC_pointcept
-base_model:
-- Pointcept/PointTransformerV3
+license: mit
+pipeline_tag: image-segmentation
+library_name: Pointcept
 ---
 
 # Models Trained with [ARKit LabelMaker](https://arxiv.org/abs/2410.13924)