Add qka files and figs (Qiskit#37)

* Create qka.py

* Add figs for qka notebook

* Add qka notebook

* Update qka.ipynb

* Update requirements.txt

added `pandas` and `scikit-learn`

* Delete qka.ipynb

* Upload updated qka notebook

* Update qka.py

Fix linter errors

* Update qka.py

Fix more linter errors

* Update qka.py

Fix one more tiny linter error

* Update qka.py

Fix more linter errors

* Update qka.py

* Update qka.py

* Delete chip.png

* Delete subgraphs.png

* Add images for the QKA tutorial

* Update QKA tutorial with new image location

* Update qka.py

* Update qka.py

fix more linter errors

* Update qka.py

and some more

* Update qka.py

* Update qka.py

fix missing return type doc

* Update qka.py

* Create temp.py

* Add images for qka to tutorials folder

* Delete qka.ipynb

* Add updated qka tutorial

* Delete temp.py

* Update path to images

* Update path again

* update path one more time

* Delete qka.ipynb

* Add updated tutorial

* Delete qka.ipynb

* Add qka tutorial with updated eqrefs

* Update qka.py

Update comment and remove `warnings`

* Delete chip.png

* Delete subgraphs.png