created and edited urls.py

jakhermosisima_reading/bookshelf/urls.py

+from django.urls import path
+from .views import BookListView, BookDetailView, AuthorListView, AuthorDetailView
+
+urlpatterns = [
+    path('books/', BookListView.as_view(), name='book-list'),
+    path('book/<int:pk>/details', BookDetailView.as_view(), name='bookitem'),
+    path('authors/', AuthorListView.as_view(), name= 'author-list'),
+    path('authors/<int:pk>/details', AuthorDetailView.as_view(), name="authoritem")
+]
+
+app_name='bookshelf'
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