doc: add ckpt link

README.md

@@ -23,4 +23,6 @@ Perhaps putting `liminal space` in the prompt works well.
 
 ![liminal space.png](https://s3.amazonaws.com/moonup/production/uploads/1671887135351-6305db1fcfbde33ef7d480ff.png)
 
+ckpt file is [here](https://huggingface.co/p1atdev/liminal-space-diffusion/blob/main/liminal-space-v0-1.ckpt).
+