Mercury-robust

Changed
- Changes in `LinearCombinationTest`: now shows linear combinations found in continuous variables

We've fixed some performance problems and updated our README.md to make it clearer.

What's Changed
* Initial code by DaniSanchezSantolaya in https://github.com/BBVA/mercury-robust/pull/1
* Adding docs and ci by champsblanc in https://github.com/BBVA/mercury-robust/pull/2
* Feature/initial notebooks by DaniSanchezSantolaya in https://github.com/BBVA/mercury-robust/pull/3
* Release by champsblanc in https://github.com/BBVA/mercury-robust/pull/4

New Contributors
* DaniSanchezSantolaya made their first contribution in https://github.com/BBVA/mercury-robust/pull/1
* champsblanc made their first contribution in https://github.com/BBVA/mercury-robust/pull/2

**Full Changelog**: https://github.com/BBVA/mercury-robust/commits/0.0.1