Update README.md (openai#326)

Author: jongwook

README.md

@@ -207,3 +207,9 @@ print(f"Accuracy = {accuracy:.3f}")
 ```
 
 Note that the `C` value should be determined via a hyperparameter sweep using a validation split.
+
+
+## See Also
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+* [OpenCLIP](https://github.com/mlfoundations/open_clip): includes larger and independently trained CLIP models up to ViT-G/14
+* [Hugging Face implementation of CLIP](https://huggingface.co/docs/transformers/model_doc/clip): for easier integration with the HF ecosystem