Add Use Case CASUS

USe of HIFIS in CASUS in general (CASUS Part one)

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_posts/2022/08/2022-08-04-use-case-casus.md

@@ -77,6 +77,6 @@ While institutes and centres such as CASUS/HZDR can develop the specific researc
 As such, we believe that creating and maintaining data repository and analytics services via the HIFIS infrastructure is a strong strategic decision that puts Helmholtz in the lead of providing soft- and hardware infrastructures for data-based research in Europe and worldwide.
 
 ## Get in contact
-For CASUS: [Michael Bussmann](mailto:?subject="desy-storage")
+For CASUS: Michael Bussmann)
 
-For HIFIS: [HIFIS Support](mailto:support@hifis.net?subject="desy-storage")
+For HIFIS: [HIFIS Support](mailto:support@hifis.net?subject="[CASUS-use-case]")