MCMC-cluster-mass Code to estimate the mass of a galaxy cluster with weak lensing using Monte Carlo Markov Chains (MCMC). We used the data in halo5.tab (https://dmz-sv-owncloud.physik.uni-muenchen.de/public.php?service=files&t=fac80dcbbccd5258a0d4ae1f9921adb9)