Updated admin.py

Added admin classes for the models and registered them to the site.

agusyquia_reading/bookshelf/admin.py

 from django.contrib import admin
+from .models import Author, Books
 
-# Register your models here.
+class AuthorAdmin(admin.ModelAdmin):
+    model = Author
+
+    search_fields = ('first_name', 'last_name',)
+    list_display = ('first_name', 'last_name', 'age', 'nationality', 'bio',)
+    list_filter = ('first_name', 'last_name', 'age', 'nationality',)
+
+class BooksAdmin(admin.ModelAdmin):
+    model = Books
+
+    search_fields = ('title', 'author', 'publisher', 'ISBN',)
+    list_display = ('title', 'author', 'publisher', 'year_published', 'ISBN', 'blurb',)
+    list_filter = ('title', 'author', 'publisher', 'year_published')
+
+    admin.site.register(Author, AuthorAdmin)
+    admin.site.register(Books, BooksAdmin)