[NumCS] Add numpy, scipy and sympy quick overview

semester3/numcs/parts/06_python/03_sympy.tex

@@ -0,0 +1,6 @@
+\subsection{Sympy}
+\label{sec:sympy}
+Sympy can be used to do symbolic operations, i.e. similar to what we would do in Analysis or the like.
+
+You usually want to follow something like the below code:
+\inputcode{python}{parts/06_python/03_sympy-ex.py}