Add a slide for Projects Using SymPy

[aktech]

Lot of people in PyCon India 2015 were interested in applications of SymPy, like where SymPy is used in real life, I think it's a good idea to add a slide for it in the presentation slides.

This may help: http://depsy.org/package/python/sympy

Projects

• Add a Project
• Add more

Eventually, we can add a wiki page for it in the SymPy repo or update this: https://github.com/sympy/sympy/wiki/SymPy-Papers

cc @leosartaj @gxyd @hargup @shivamvats @sumith1896 @asmeurer