Adding license documentation to interface class docblocks.

src/Mod/TechDraw/App/DrawTile.pyi

@@ -8,5 +8,7 @@ from App.DocumentObject import DocumentObject
 )
 class DrawTile(DocumentObject):
     """
+    Author: WandererFan (wandererfan@gmail.com)
+    License: LGPL-2.1-or-later
     Feature for adding tiles to leader lines
     """