add colab link

README.md

@@ -60,7 +60,7 @@ The following screenshot is an example of interaction with the instructed model:
 
 # How to Get Started with the Model
 
-This [tutorial](https://github.com/huggingface/notebooks/pull/418/) shows a simple example to fine-tune IDEFICS on custom data. This [colab notebook](TODO) showcases how to do the fine-tuning in 4bits precision. TODO: change to the correct link once it's merged.
+This [tutorial](https://github.com/huggingface/notebooks/pull/418/) shows a simple example to fine-tune IDEFICS on custom data. This [colab notebook](https://colab.research.google.com/drive/1o6hSdApDoaavkAXTI7clIG1ZWfJvwzRj?usp=sharing) showcases how to do the fine-tuning in 4bits precision. TODO: change to the correct link once it's merged.
 
 We provide quick-start code for both the base and the instruct models.