add model link

README.md

@@ -16,7 +16,9 @@ developers at [01.AI](https://01.ai/). The first public release contains two
 bilingual(English/Chinese) base models with the parameter sizes of 6B([`Yi-6B`](https://huggingface.co/01-ai/Yi-6B)) 
 and 34B([`Yi-34B`](https://huggingface.co/01-ai/Yi-34B)). Both of them are trained 
 with 4K sequence length and can be extended to 32K during inference time. 
-The `Yi-6B-200K` and `Yi-34B-200K` are base model with 200K context length.
+The [`Yi-6B-200K`](https://huggingface.co/01-ai/Yi-6B-200K)
+and [`Yi-34B-200K`](https://huggingface.co/01-ai/Yi-34B-200K) are base model with
+200K context length.
 
 ## News