add arxiv link for LDM

README.md

@@ -103,7 +103,7 @@ Trainig statistics are available at [Weights and Biases](https://wandb.ai/tempof
 
 ## Acknowledgements
 
-* [CompVis](https://github.com/CompVis/) for [Latent Diffusion Models]() + [Stable Diffusion]()
+* [CompVis](https://github.com/CompVis/) for [Latent Diffusion Models](https://arxiv.org/abs/2112.10752) + [Stable Diffusion](https://github.com/CompVis/stable-diffusion)
 * [Meta AIs Make-A-Video](https://arxiv.org/abs/2209.14792) for the research of applying pseudo 3D convolution and attention to existing image models
 * [Phil Wang](https://github.com/lucidrains) for the torch implementation of [Make-A-Video Pseudo3D convolution and attention](https://github.com/lucidrains/make-a-video-pytorch/)
 * [lxj616](https://huggingface.co/lxj616) for initial proof of feasibility of LDM + Make-A-Video