added urls.py

bookshelf/urls.py

 from django.urls import path
-from .views import Homepage_View, Books_List_View, Books_Detail_View, Authors_List_View, Authors_Detail_View
+from .views import Homepage_View, Books_List_View, Books_Detail_View, Authors_List_View, Authors_Detail_View, Book_Create_View, Author_Create_View, Book_Update_View, Author_Update_View
 
 urlpatterns = [
     path('home/', Homepage_View, name='home'),
@@ -7,4 +7,8 @@ urlpatterns = [
     path('books/<int:pk>/details/', Books_Detail_View.as_view(), name='book-details'),
     path('authors/', Authors_List_View.as_view(), name='authors-list'),
     path('authors/<int:pk>/details/', Authors_Detail_View.as_view(), name='author-details'),
+    path('books/add/', Book_Create_View.as_view(), name='add-book'),
+    path('authors/add/', Author_Create_View.as_view(), name='add-author'),
+    path('books/<pk>/edit/', Book_Update_View.as_view(), name='edit-book'),
+    path('authors/<pk>/edit/', Author_Update_View.as_view(), name='edit-author'),
 ]
\ No newline at end of file