add README

Author: omlins

README.md

@@ -1,2 +1,6 @@
 # JUHPC
-HPC setup for juliaup, julia and HPC key packages requiring system libraries
+Create an HPC setup for juliaup, julia and some HPC key packages (MPI.jl, CUDA.jl, HDF5.jl, ADIOS2.jl, ...), including
+- preferences for HPC key packages that require system libraries;
+- a wrapper for juliaup that installs juliaup (and latest julia) on 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).