add VSS checkbox on registration

apps/member/models.py

@@ -134,6 +134,11 @@ class Profile(models.Model):
         default=False,
     )
 
+    VSS_charter_read = models.BooleanField(
+        verbose_name=_("VSS charter read"),
+        default=False
+    )
+
     @property
     def ens_year(self):
         """