Fix the task tag and add description

README.md

@@ -1,6 +1,8 @@
 ---
 license: apache-2.0
-pipeline_tag: image-segmentation
+pipeline_tag: mask-generation
 ---
 
-Paper: https://arxiv.org/abs/2402.05008
+# EfficientViT-SAM
+
+This is the model repository for the paper [EfficientViT-SAM: Accelerated Segment Anything Model Without Performance Loss](https://arxiv.org/abs/2402.05008).