add documentation rel perm

Documentation/ProjectFile/properties/property/RelPermBrooksCorey/c_RelPermBrooksCorey.md

+The relative permeability function proposed by Brooks&Corey (1964) \cite BrooksCorey1964.

Documentation/ProjectFile/properties/property/RelPermBrooksCorey/t_k_rel_min_gas.md

+The minimal relative permeability of the gas (or non-wetting) phase.

Documentation/ProjectFile/properties/property/RelPermBrooksCorey/t_k_rel_min_liquid.md

+The minimal relative permeability of the liquid (or wetting) phase.

Documentation/ProjectFile/properties/property/RelPermBrooksCorey/t_lambda.md

+Exponent of the Brooks&Corey relative permeability function.

Documentation/ProjectFile/properties/property/RelPermBrooksCorey/t_residual_gas_saturation.md

+The smallest degree of saturation of the gas (or non-wetting) phase in the medium.

Documentation/ProjectFile/properties/property/RelPermBrooksCorey/t_residual_liquid_saturation.md

+The smallest degree of saturation of the liquid (or wetting) phase in the medium.