Add exercise notebooks

app/exercises/Exercise 1 - Scat.ipynb

app/exercises/Exercise 2 - XRR.ipynb

app/solutions/Solution 1 - Scat.ipynb

app/solutions/Solution 2 - XRR.ipynb

data/scat/angles.npy

data/scat/parameter.npy

data/scat/w_train.npy

data/scat/x_train.npy

data/scat/y_train.npy

data/xrr/measurement.npy

data/xrr/omega.npy

data/xrr/w_train.npy

data/xrr/x_train.npy

data/xrr/y_train.npy

img/notebooks/scat_setup.png

src/utils.py