add Viking to detectors init file

src/toolbox_scs/detectors/__init__.py

@@ -7,6 +7,7 @@ from .dssc_misc import *
 from .dssc_processing import *
 from .hrixs import *
 from .pes import *
+from .viking import *
 from .xgm import *
 
 __all__ = (
@@ -19,5 +20,6 @@ __all__ = (
     + dssc_processing.__all__
     + hrixs.__all__
     + pes.__all__
+    + viking.__all__
     + xgm.__all__
 )