Add admin views.

bikeshop_project/core/admin.py

@@ -1,3 +1,5 @@
 from django.contrib import admin
+from .models import Membership, Payment
 
 # Register your models here.
+admin.site.register([Membership, Payment])

bikeshop_project/registration/admin.py

@@ -1,3 +1,6 @@
 from django.contrib import admin
+from .models import Member
+
 
 # Register your models here.
+admin.site.register(Member)