class Gamma : public feasst::ModelParam
Add a ModelParam to FEASST by using this file as a template and instruction set. Follow the same steps detailed in /feasst/plugin/example/README.rst. In summary, copy model_param_example.[h/cpp] to new_name.[h/cpp], replace Gamma with NewName, then replace MODEL_PARAM_EXAMPLE with NEW_NAME.
While sigma, epsilon and cutoff are already implemented in Model, and the lambda parameter was already implemented in LennardJonesAlpha, the gamma parameter is not yet defined. Thus, we will go through the exercise here.