Update INSTALL.md
Step by step cygwin installation of mhm and newly created youtube video link for mhm v5.11.1
From June 06th, all CI Jobs will run on federated Helmholtz infrastructure by default. If you need UFZ-internal resources, add the tag "ufz-internal" to your CI configuration or use a custom GitLab Runner (e.g. EVE). If you have any questions, feel free to contact us!
Step by step cygwin installation of mhm and newly created youtube video link for mhm v5.11.1