Update README.md

Jupyter_Notebook_Setup/README.md

 # Instructions how to setup Jupyter Notebook
-
+Jupyter Notebook was used at the beginning to try out certain things and playing around with sympy before certain 
+aspects became incorporated into the code. So Jupyter notebook is not necessary to run an LDD simulation. 
+In case you want to use it, here is how to set it up.
 ## Setup
 Install virtualenv and pip. Then run