Add new file

src/8_many_atoms_sol.md

+```{python initialize=true}
+import matplotlib
+from matplotlib import pyplot
+
+import numpy as np
+
+from common import draw_classic_axes, configure_plotting
+
+configure_plotting()
+
+pi = np.pi
+```
+
+# Solutions for lecture 7 exercises
+
+## Exercise 1: analyzing the diatomic vibrating chain
+
+### Subquestion 1
+
+
+8_many_atoms_sol.md
\ No newline at end of file