Add a dummy setuptools file.

Will probably just use this for versioning which can match up in the
CHANGELOG.md to help people see which version to install. No releases
are tagged so far though.

setup.py

@@ -0,0 +1,21 @@
+"""Package information."""
+
+from setuptools import find_packages, setup
+
+with open('README.md', 'r') as handle:
+    long_description = handle.read()
+
+setup(
+    name='xppl',
+    version='0.0.2',
+    description='An experimental library.',
+    long_description=long_description,
+    long_description_content_type='text/markdown',
+    packages=find_packages(exclude=['tests']),
+    platforms='any',
+    classifiers=[
+        'Environment :: Web Environment',
+        'Framework :: Flask',
+        'Programming Language :: Python :: 3',
+    ]
+)