Merge branch 'xfel_kernel' into 'master'

Xfel kernel

See merge request SCS/ToolBox!68

Readme.md

+# SCS ToolBox
+
+## Kernel
+
+The SCS ToolBox is design to work in the exfel_anaconda3 environement. This can
+be selected on the online cluster by:
+
+`module load exfel exfel_anaconda3`
+
+before launching the jupyter-notebook or on max-jhub by selecting the 'xfel'
+kernel instead of the 'Python 3' anaconda environement maintained by DESY.
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