added add-book in urls

bellapanghulan_reading/bookshelf/urls.py

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