installation guide (temporary)

Remedy 101

1. stan - mac For pch error as below, run the following

PCH file was compiled for the target 'x86_64-apple-macosx12.0.0' but the current translation unit is being compiled for target 'arm64-apple-
macosx12.0.0'\n2 errors generated.

import cmdstanpy
cmdstanpy.install_cmdstan(overwrite = True)