Qiskit-quantum-knn

- Adjusted the tolerance level of fidelity check
- Fixed bug where the pytest was looking at a specific GitHub repo of this installation instead of the tag itself.

- fixed errors within pytest
- changed contact information
- added lots of documentation
- fixed requirements.txt to not containt pkg-resources
- made _qknn_construction public by renaming it without the underscore
- fixed the QkNN not working with low amount of shots

- Added documentation hosted on [ReadTheDocs](https://qiskit-quantum-knn.readthedocs.io/).

First main release.
A Quantum K-Nearest Neighbours algorithm which fully runs on a quantum computer for classifying vectors via the Quantum Fidelity.

- Implemented logging in the test.
- Migrated oracle creation outside of the qknn construction, so that it can eventually be moved outside of the creation loop
- Added some more comments, used numpy for binary string representation.
- Added test for uneven number of train states, and that proper exception is raised when initialising with uneven dimensionality.