update readme

environment.yaml

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+name: animatediff
+channels:
+  - pytorch
+  - xformers
+dependencies:
+  - python=3.10
+  - pytorch==1.12.1
+  - torchvision==0.13.1
+  - torchaudio==0.12.1
+  - cudatoolkit=11.3
+  - xformers
+  - pip
+  - pip:
+    - diffusers[torch]==0.11.1
+    - transformers==4.25.1
+    - imageio==2.27.0
+    - gdown
+    - einops
+    - omegaconf
+    - safetensors