Added seed (part 6)

manage.py

@@ -61,5 +61,25 @@ def recreate_db():
     db.session.commit()
 
 
+@manager.command
+def seed_db():
+    """Seeds the database."""
+    db.session.add(Exercise(
+        exercise_body='Define a function called sum that takes two integers as arguments and returns their sum.',
+        test_code='print(sum(2, 3))',
+        test_code_solution='5'
+    ))
+    db.session.add(Exercise(
+        exercise_body='Define a function called reverse that takes a string as an argument and returns the string in reversed order.',
+        test_code='print(reverse(racecar))',
+        test_code_solution='racecar'
+    ))
+    db.session.add(Exercise(
+        exercise_body='Define a function called factorial that takes a random number as an argument and then returns the factorial of that given number.',
+        test_code='print(factorial(5))',
+        test_code_solution='120'
+    ))
+    db.session.commit()
+
 if __name__ == '__main__':
     manager.run()