added a resolver for students

Author: Ronak-23

backend/family_tree/family_tree/settings.py

@@ -36,6 +36,7 @@
     'django.contrib.admin',
     'django.contrib.auth',
     'django.contrib.contenttypes',
+    'django_filters',
     'django.contrib.sessions',
     'django.contrib.messages',
     'django.contrib.staticfiles',

backend/family_tree/student/schema.py

@@ -11,4 +11,7 @@ class Meta:
 class Query(graphene.ObjectType):
     students=graphene.List(StudentType)
 
+    def resolve_students(root,info):
+        return Student.objects.all()
+
 schema=graphene.Schema(query=Query)