Updated models.py

Added the Books and Author classes and added their respective models.

agusyquia_reading/bookshelf/models.py

 from django.db import models
 
+class Author(models.Model):
+    first_name = models.CharField(max_length=60)
+    last_name = models.CharField(max_length=60)
+    age = models.IntegerField(default=0)
+    nationality = models.CharField(max_length=60)
+    bio = models.TextField(max_length=700)
+
+class Books(models.Model):
+    title = models.CharField(max_length=100)
+    author = models.ForeignKey(Author, on_delete=models.CASCADE)
+    publisher = models.CharField(max_length=69)
+    year_published = models.DateField()
+    ISBN = models.IntegerField(default=0)
+    blurb = models.TextField(max_length=200)
+
 # Create your models here.