Qiskit Hydrogen Atom Simulator as Demonstrator

[koalamitice]

We want to add Materialsimulation to the Toolbox. As a first example, add the Qiskit Hydrogen Example as a Demonstrator.

https://github.com/qiskit-community/qiskit-community-tutorials/blob/master/chemistry/h2_var_forms.ipynb

Talk to Rinor for more details.

[koalamitice]

Required to implement #132