Version 0.1.0

Context

This MR setups the project and provides the basic code architecture, as well as test cases.
Two things remain to be done to have a minimal working release:

1. implement the computation of the aerodynamic influence coefficients
2. implement the import of the nonlinear solution and its interpolation on the Cartesian grid

Tests

Passed on ubuntu20.04 (python 3.8.2) and msys2 (python 3.8.1). Note: timers test might fail on msys