fix: add documentation

bec_plugins/utils/csaxs_post_archive.py

@@ -9,7 +9,8 @@ from bec_lib.core.file_utils import FileWriterMixin
 class csaxs_archiver:
     """Class to archive data from a beamtime.
     To run this script from a shell, go to discovery.psi.ch and copy your token.
-    Afterwards, get a Keberos token (kinit) for yourself in the shell that you run this code.
+    Afterwards, get a Keberos token (kinit) for yourself in the shell.
+    Activate the bec_venv by doing "source bec_venv/bin/activate" and then run this code via  python $filename.
     As a last step, adjust the dictionary below in if __name__ == '__main__' with your token as well as information about the experiment
     """