Add division functionality and test

pythoncalculator/__init__.py

@@ -1,2 +1,3 @@
 from .add import add 
-from .subtract import subtract 
+from .divide import divide 
+from .subtract import subtract

pythoncalculator/divide.py

@@ -0,0 +1,2 @@
+def divide(x, y):
+    return x / y

test/test_divide.py

@@ -0,0 +1,5 @@
+from pythoncalculator import divide
+
+
+def test_divide():
+    assert divide(10, 2) == 5