added modeladmin for book and author obj

bookshelf/admin.py

@@ -2,5 +2,15 @@ from django.contrib import admin
 from .models import Author, Books
 
 # Register your models here.
+
+
+class BookAdmin(admin.ModelAdmin):
+    readonly_fields = ['id']
+
+
+class AuthorAdmin(admin.ModelAdmin):
+    readonly_fields = ['id']
+
+
 admin.site.register(Author)
-admin.site.register(Books)
+admin.site.register(Books, BookAdmin)
\ No newline at end of file