added test for addition of two fractions as well as corresponding functionality

src/main/py/fractions.py

@@ -8,3 +8,7 @@ def reduceFraction(num, denom):
     num /= gcdOfFraction
     denom /= gcdOfFraction
     return (num, denom)
+
+def addFractions(num1, denom1, num2, denom2):
+    result_num = num1 + num2
+    return (result_num, denom1)

src/test/py/test_fractions.py

@@ -18,6 +18,9 @@ class fractions(unittest.TestCase):
     def test_reduce_fraction_56_by_32_should_be_7_by_4(self):
         self.assertEqual(reduceFraction(56,32), (7,4))
 
+    def test_add_fractions_1_by_5_and_2_by_5_should_be_3_by_5(self):
+        self.assertEqual(addFractions(1,5,2,5), (3,5))
+
 
 if __name__ == '__main__':
     unittest.main()