Create COMP_brms.md

Author: maxbiostat

ProgrammingProjects/COMP_brms.md

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+## Principled and efficient truncation of the Conway-Maxwell Poisson distribution in brms
+
+In this project you will take the (Stan) implementations of the techniques in [this](https://arxiv.org/abs/1308.2045) paper, which are [here](https://github.com/GuidoAMoreira/stan_summer) and port them to [brms](https://github.com/paul-buerkner/brms).
+In particular, you will improve the implementation of the [Conway-Maxwell Poisson](https://en.wikipedia.org/wiki/Conway%E2%80%93Maxwell%E2%80%93Poisson_distribution) pmf in [here](https://github.com/paul-buerkner/brms/blob/master/inst/chunks/fun_com_poisson.stan) by adding adaptive truncation.
+You will have to run correctness tests as well as ensure that the implementation is stable enough to be used in general regression problems.