Added views to created, edit and delete metadata set under the setup menu, added corresponding new permissions for these views

apps/metadata/forms.py

@@ -99,3 +99,8 @@ MetadataRemoveFormSet = formset_factory(MetadataRemoveForm, extra=0)
 class MetadataTypeForm(forms.ModelForm):
     class Meta:
         model = MetadataType
+
+
+class MetadataSetForm(forms.ModelForm):
+    class Meta:
+        model = MetadataSet