added get absolute url function for Author model

lancedamalerio_reading/bookshelf/models.py

@@ -14,6 +14,9 @@ class Author(models.Model):
     def __str__(self):
         return self.first_name + " " + self.last_name 
     
+    def get_absolute_url(self):
+        return (reverse('bookshelf:author-details', kwargs={'pk' : self.pk}))
+
 #Book
 #title; author; publisher; year_published; ISBN; blurb