Add pipeline tag, link to code

This PR adds a pipeline tag, ensuring people can find your model at https://huggingface.co/models?pipeline_tag=image-to-image. It also adds a link to the codebase.

README.md

@@ -1,4 +1,8 @@
 ---
 license: mit
+pipeline_tag: image-to-image
 ---
-arxiv.org/abs/2502.20272
+
+arxiv.org/abs/2502.20272
+
+Code: https://github.com/Fediory/HVI-CIDNet