Added packaging build files

The committed files define the requirements and information related to
clog when packaging the module into a library.

setup.py instantiates the build script process used by pip in editor
mode, with the support of setup.cfg. File uses traditional build
approach using the setuptools library.

pyproject.toml

@@ -0,0 +1,3 @@
+[build-system]
+requires = ["setuptools>=42.0", "wheel"]
+build-backend = "setuptools.build_meta"

setup.cfg

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+[metadata]
+name = clog
+description = logging as simple as putting on a shoe.
+author = Ethan Smith-Coss
+license = GNU GPLv3+
+license_file = LICENCE.txt
+platforms = unix, linux, osx, cygwin, win32
+classifiers =
+    Development Status :: 3 - Alpha
+    Environment :: Other Environment
+    Intended Audience :: Developers
+    License :: OSI Approved :: GNU General Public License v3 or later (GPLv3+)
+    Natural Language :: English
+    Operating System :: OS Independent
+    Programming Language :: Python :: 3
+    Programming Language :: Python :: 3.6
+    Programming Language :: Python :: 3.7
+    Programming Language :: Python :: 3.8
+    Programming Language :: Python :: 3.9
+    Programming Language :: Python :: 3.10
+    Programming Language :: Python :: 3 :: Only
+    Topic :: System :: Logging
+    Topic :: Software Development :: Libraries
+    Topic :: Utilities
+
+[options]
+python_requires = >=3.6, <4
+package_dir =
+    =clog
+zip_safe = no

setup.py

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+#!/usr/bin/env python
+import os
+import sys
+from setuptools import setup
+
+CURRENT_PYVERSION = sys.version_info[:2]
+REQUIRED_PYVERSION = (3, 6)
+
+if CURRENT_PYVERSION < REQUIRED_PYVERSION:
+    sys.stderr.write(
+"""
+==================================
+Whoops, unsupported Python version
+==================================
+It's seems as though your foot size does not meet the minimum required
+shoe size for clog. Your foot size must at least be {}.{}, otherwise the
+shoe will just fall off - and nobody wants to smell you stinky feet!
+
+Your current foot size is {}.{} which you are trying to put the shoe on.
+If you wish to resolve this, consider growing your feet from the
+official Python website to the minimum required version.
+
+...just make sure there aren't any snakes in your shoes afterwards.
+""".format(
+            *(REQUIRED_PYVERSION + CURRENT_PYVERSION)
+        )
+    )
+    sys.exit(1)
+
+
+info = {}
+here = os.path.abspath(os.path.dirname(__file__))
+with open(os.path.join(here, "clog", "__version__.py"), "r", encoding="utf-8") as f:
+    exec(f.read(), info)
+
+with open("README.md", 'r', encoding="utf-8") as f:
+    readme = f.read()
+
+
+if __name__ == "__main__":
+    setup(
+        version=info['__version__'],
+        long_description=readme,
+        long_description_content_type="text/markdown",
+        url=info['__url__'],
+        include_package_data=True,
+        author_email=info['__author_email__'],
+        package_data={"": ["LICENCE.txt"]}
+    )