Uploading chapter 11 remaining files

Chapter11/grades_ms/grades/grades_svc/models.py

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+from django.db import models
+class Grade(models.Model):
+    grade_id = models.CharField(max_length=20)
+    building = models.CharField(max_length=200)
+    teacher = models.CharField(max_length=200)
+
+    def __str__(self):
+        return self.grade_id