Update README.md

Compiler/fluka/README.md

@@ -1 +1,37 @@
+# FLUKA and Flair module
 
+PSI has a institutional license for FLUKA and Flair. Anyway users should register.
+
+## Download
+
+https://fluka.cern
+
+
+## Install
+```
+FLUKA4_VERSION=2.2
+FLAIR_VERSION=3.1-15.1
+
+GCC_VERSION=9.3.0
+PYTHON_VERSION=3.8.8
+
+PREFIX="${PMODULES_ROOT}/Compiler/fluka4/${FLUKA4_VERSION}/gcc/${GCC_VERSION}"
+DISTFILES_DIR='/afs/psi.ch/software/Pmodules/distfiles'
+FLUKA_TAR="${DISTFILES_DIR}/fluka-4-${FLUKA4_VERSION}.x86-Linux-gfor${GCC_VERSION/.*}.tar.bz2"
+FLAIR_TAR="${DISTFILES_DIR}/flair-${FLAIR_VERSION}.tar.bz2"
+GEOVIEWER_TAR="${DISTFILES_DIR}/flair-geoviewer-${FLAIR_VERSION}.tar.bz2"
+
+module load gcc/${GCC_VERSION} Python/${PYTHON_VERSION}
+
+mkdir -p "${PREFIX}" && cd "$_"
+
+tar --strip-components=1 -xvf "${FLUKA_TAR}"
+cd src
+make
+
+mkdir -p "${PREFIX}/flair" && cd "$_"
+make
+```
+
+## Install FLUKA
+```