Adding license documentation to interface class docblocks.

src/Mod/Measure/App/MeasureBase.pyi

@@ -9,5 +9,7 @@ from App.DocumentObject import DocumentObject
 )
 class MeasureBase(DocumentObject):
     """
+    Author: David Friedli(hlorus) (david@friedli-be.ch)
+    License: LGPL-2.1-or-later
     User documentation here
     """

src/Mod/Measure/App/Measurement.pyi

@@ -10,6 +10,8 @@ from Base.Metadata import export
 )
 class Measurement(BaseClass):
     """
+    Author: Luke Parry (l.parry@warwick.ac.uk)
+    License: LGPL-2.1-or-later
     Make a measurement
     """