Add README.md

README.md

+# SSH scripts for connecting to mistral.dkrz.de
+
+These scripts help you to establish a connection to vncserver or
+Jupyter Notebook running on a mistral node. The scripts handle job submission,
+tunnel set-up, and start the client application on your local system.
+
+As bash scripts they run natively on Linux, MacOS, and other Unix-like
+systems. After installing WSL (Windows Subsystem for Linux), they also run
+on Microsoft Windows 10.
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