Add pipeline tag, link to project page, correct paper link

This PR adds the `pipeline_tag: text-generation` to the model card metadata, linking the project page, and correcting the paper link to the Hugging Face Papers link.

README.md

@@ -1,12 +1,13 @@
 ---
-library_name: transformers
-license: apache-2.0
-language:
-- en
 datasets:
 - Skylion007/openwebtext
+language:
+- en
+library_name: transformers
+license: apache-2.0
 metrics:
 - perplexity
+pipeline_tag: text-generation
 ---
 
 ## Using MDLM
@@ -28,9 +29,7 @@ was trained using a forward diffusion process that generates inputs varying from
 reconstruct the original input from these varying levels of masking, outputting logits in the process.
 The training regimen comprised one million steps on the OpenWebText corpus, involving the processing of a total of `33 billion` tokens.
 
-For more details, please see our paper: [Simple and Effective Masked Diffusion Language Models](http://arxiv.org/abs/2406.07524).
-
-
+For more details, please see our paper: [Simple and Effective Masked Diffusion Language Models](https://huggingface.co/papers/2406.07524).
 
 ## Citation