Merge pull request #418 from bedroge/add_ulhpc

add ULHPC to list of systems where EESSI available

Author: Neves-P

docs/systems.md

@@ -94,6 +94,12 @@ MareNostrum 5 is the EuroHPC JU supercomputer hosted by the [Barcelona Supercomp
 
 * Aristotle: [General documentation](https://hpc.it.auth.gr/nodes-summary_en/) | [EESSI @ Aristotle](https://hpc.it.auth.gr/software/eessi/)
 
+### Luxembourg
+
+#### University of Luxembourg
+
+* ULHPC platform: [General documentation](https://hpc-docs.uni.lu/) | [EESSI @ ULHPC](https://hpc-docs.uni.lu/software/eessi/)
+
 ### Netherlands
 
 #### SURF