Installation guide HU HPC

[jakimowb]

Create an installation guide how to install the EnMAP-Box on the HU HPC enviroment / in generally on none-desktop environments.

• Linux environment
• No-GUI
• installation of QGIS + EnMAP-Box plugin
• show use-case how to use a processing model in that environment (see https://github.com/EnMAP-Box/enmap-box/issues/948)
• how to use this model with SLURM