Added one test and basic addition functionality to fulfill it

src/main/py/primitive_calculations.py

@@ -0,0 +1,2 @@
+def add(first_number, second_number):
+    return first_number + second_number

src/test/py/test_primitive_calculations.py

@@ -0,0 +1,17 @@
+import unittest
+from src.main.py.primitive_calculations import *
+
+
+class primitive_calculations(unittest.TestCase):
+    def setUp(self):
+        pass
+
+    def tearDown(self):
+        pass
+
+    def test_add_5_plu_5_equals_10(self):
+        self.assertEqual(add(5, 5), 10)
+
+
+if __name__ == "__main__":
+    unittest.main()