added Summary & review lecture video

src/15_SummaryAndReview.md

+```python tags=["initialize"]
+ 
+from matplotlib import pyplot
+
+import numpy as np
+from scipy.optimize import curve_fit
+from scipy.integrate import quad
+
+from common import draw_classic_axes, configure_plotting
+
+configure_plotting()
+
+```
+
+# Summary & review
+
+??? info "Lecture video"
+
+    <iframe width="100%" height="315" src="https://www.youtube.com/watch?v=NuQgJRQuJy8" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>