Add library_name and pipeline_tag to model card

This PR adds the correct library and pipeline tag to the model card, allowing for more effective discoverability.

README.md

@@ -1,3 +1,12 @@
 ---
 license: mit
----
+library_name: transformers
+pipeline_tag: text-generation
+---
+
+We introduce LLaDA (<b>L</b>arge <b>La</b>nguage <b>D</b>iffusion with m<b>A</b>sking), a diffusion model with an unprecedented 8B scale, trained entirely from scratch, 
+rivaling LLaMA3 8B in performance, as described in [the paper](https://hf.co/papers/2502.09992).
+
+Project page: https://ml-gsai.github.io/LLaDA-demo/.
+
+For code and sample usage, see https://github.com/ML-GSAI/SMDM.