Add instruct demo for idefics2 (huggingface#1997)

* Add instruct demo for idefics2

* Update idefics2.md

Author: merveenoyan

idefics2.md

@@ -133,6 +133,7 @@ If you wish to deep dive further, here is the compilation of all ressources for
 * [OBELICS with its dataset card](https://huggingface.co/datasets/HuggingFaceM4/OBELICS)
 * [WebSight with its dataset card](https://huggingface.co/datasets/HuggingFaceM4/WebSight)
 * [Idefics2 fine-tuning colab](https://colab.research.google.com/drive/1rm3AGquGEYXfeeizE40bbDtcWh5S4Nlq?usp=sharing)
+* [Idefics2-8B model demo (not the chatty model)](https://huggingface.co/spaces/HuggingFaceM4/idefics-8b)
 * Idefics2 demo: (coming soon)
 * Idefics2 paper: (coming soon)