Update setup.py to include license

Author: grantjenks

setup.py

@@ -1,12 +1,19 @@
+#!/usr/bin/env python
 from setuptools import setup, Extension
 import re
+import os
+
+
+def read_file(filename, encoding='utf-8'):
+    with open(filename, 'r', encoding=encoding) as f:
+        return f.read()
 
 
 def get_version():
     """
     Extract the version number from arraydeque.c.
-    Looks for a line of the form:
-        #define ARRAYDEQUE_VERSION "0.1.0"
+    It looks for a line of the form:
+        #define ARRAYDEQUE_VERSION "x.y.z"
     """
     with open('arraydeque.c', 'r', encoding='utf-8') as f:
         content = f.read()
@@ -16,11 +23,29 @@ def get_version():
     raise RuntimeError('Unable to find version string in arraydeque.c.')
 
 
-module = Extension('arraydeque', sources=['arraydeque.c'])
+here = os.path.abspath(os.path.dirname(__file__))
 
 setup(
     name='arraydeque',
     version=get_version(),
-    description='Array-backed deque implementation',
-    ext_modules=[module],
+    description='Array-backed deque implementation written in C for fast double-ended operations.',
+    long_description=read_file('README.md'),
+    long_description_content_type='text/markdown',
+    author='Grant Jenks',
+    author_email='grant.jenks@gmail.com',
+    url='https://github.com/grantjenks/python-arraydeque',
+    license='Apache License 2.0',
+    license_files=['LICENSE'],
+    classifiers=[
+        'Development Status :: 5 - Production/Stable',
+        'Intended Audience :: Developers',
+        'Topic :: Software Development :: Libraries',
+        'License :: OSI Approved :: Apache Software License',
+        'Programming Language :: C',
+        'Programming Language :: Python',
+        'Programming Language :: Python :: 3',
+        'Programming Language :: Python :: Implementation :: CPython',
+    ],
+    ext_modules=[Extension('arraydeque', sources=['arraydeque.c'])],
+    python_requires='>=3.8',
 )