Add setup.py

setup.py module makes it possible to install the my_first_calculator.py script into virtualenv.

setup.py

@@ -0,0 +1,19 @@
+import os
+from setuptools import setup
+
+
+def read(fname):
+    return open(os.path.join(os.path.dirname(__file__), fname)).read()
+
+
+setup(
+    name="my_first_calculator",
+    version="0.1",
+    author="Alexander Lewis",
+    author_email="info@acelewis.com",
+    description="This is my first calculator",
+    url="https://github.com/AceLewis/my_first_calculator.py",
+    packages=[],
+    py_modules=['my_first_calculator'],
+    long_description=read('README.md'),
+)