added course model

assignments/models.py

 from django.db import models
 
+class Course(models.Model):
+    course_code = models.CharField(max_length=10)
+    course_title = models.CharField(max_length=50)
+    course_section = models.CharField(max_lenth=3)
 
 class Assignment(models.Model):
     name = models.CharField(max_length=30)
     description = models.TextField()
     max_points = models.IntegerField()
     passing_score = models.IntegerField()
+    course = models.ForeignKey(Course, on_delete=models.CASCADE, null=True)
 
     def save(self):
         self.passing_score = int(0.6*self.max_points)
         super(Assignment, self).save()
-
-    
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