update README

Author: omlins

README.md

@@ -3,4 +3,4 @@ Create an HPC setup for juliaup, julia and some HPC key packages (MPI.jl, CUDA.j
 - preferences for HPC key packages that require system libraries;
 - a wrapper for juliaup that installs juliaup (and latest julia) in an appropriate location (e.g., scratch) if it is not already installed;
 - an activation script that sets environment variables for juliaup, julia and HPC key packages;
-- an uenv view equivalent to the activation script (optional).
+- optionally executing a site-specific post installation julia script, using the project where preferences were set (e.g, to modify preferences or to create an uenv view equivalent to the activation script).