Add quantum solvers for the coloring problem #236
Merged
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We add two solvers (QAOA algorithm and VQE algorithm) to solve the coloring problem, each solver has two versions.
One to minimize the number of color that we need to solve the coloring problem and another to say for a given number of color if the coloring problem is feasible for this number of color.
We add an example of a little problem and an example to use optuna for a coloring problem.