Update README.md

Author: mhjensen

README.md

@@ -71,6 +71,7 @@ in addition to the lectures, we have often followed five main paths:
 - Deep learning, neural networks, basic equations
 - Slides at https://github.com/CompPhysics/AdvancedMachineLearning/blob/main/doc/pub/week1/ipynb/week1.ipynb
 - Recommended reading Goodfellow et al chapters 6 and 7 and Raschka chapter 11
+- Video of lecture at https://youtu.be/SY57dC46L9o
 
 ##  January 27-31
 - Mathematics  of deep learning, basics of neural networks and writing a neural network code