updated installation instructions

README.md

@@ -10,7 +10,8 @@ MLAir is based on several python frameworks. To work properly, you have to insta
 `requirements.txt` file. Additionally to support the geographical plotting part it is required to install geo
 packages built for your operating system. Name names of these package may differ for different systems, we refer
 here to the opensuse / leap OS. The geo plot can be removed from the `plot_list`, in this case there is no need to 
-install the geo packages.
+install the geo packages. For special instructions to install MLAir on the Juelich HPC systems, see 
+[here](#special-instructions-for-installation-on-jülich-hpc-systems).
 
 * (geo) Install **proj** on your machine using the console. E.g. for opensuse / leap `zypper install proj`
 * (geo) A c++ compiler is required for the installation of the program **cartopy**