Added square root functionality and one test for it

src/main/py/logarithmic_and_expo_and_root_calculations.py

@@ -0,0 +1,5 @@
+import math
+
+
+def sqr(first_number):
+    return math.sqrt(first_number)

src/test/py/logarithmic_ann_expo_and_root_calculations.py

@@ -0,0 +1,17 @@
+import unittest
+from src.main.py.logarithmic_and_expo_and_root_calculations import *
+
+
+class primitive_calculations(unittest.TestCase):
+    def setUp(self):
+        pass
+
+    def tearDown(self):
+        pass
+
+    def test_sqr_of_4_equals_2(self):
+        self.assertEqual(sqr(4), 2)
+
+
+if __name__ == "__main__":
+    unittest.main()