added Author list and detail views in urlpatterns

bellapanghulan_reading/bookshelf/urls.py

 from django.urls import path
 
 from . import views
-from .views import (Homepage, BooksListView, BooksDetailView)
+from .views import (Homepage, BooksListView, BooksDetailView, AuthorListView, AuthorDetailView)
 
 urlpatterns = [
+    path('authors', AuthorListView.as_view(), name='authors'),
+    path('authors/<int:pk>/details', AuthorDetailView.as_view(), name='author-details'),
     path('books', BooksListView.as_view(), name='books'),
     path('books/<int:pk>/details', BooksDetailView.as_view(), name='book-details'),
     path('home', Homepage.as_view(), name='home'),