Enable distribution via pip/setuptools

Thanks to @Mic92 for the proof-of-concept

Refers to #26

MANIFEST.in

+include README.md
+include LICENSE.txt
+recursive-include kconfig_hardened_check *

setup.cfg

+[metadata]
+name = kconfig-hardened-check
+version = 0.5.5
+author = Alexander Popov
+author_email = alex.popov@linux.com
+home-page = https://github.com/a13xp0p0v/kconfig-hardened-check
+description = A tool for checking the hardening options in the Linux kernel config
+long-description = file: README.md
+license = GNU General Public License v3 (GPLv3)
+license-file = LICENSE.txt
+classifiers = 
+	Development Status :: 5 - Production/Stable
+	License :: OSI Approved :: GNU General Public License v3 (GPLv3)
+	Topic :: Security
+	Operating System :: POSIX :: Linux
+	Environment :: Console
+	Programming Language :: Python :: 3
+
+[options]
+zip_safe = true
+include_package_data = true
+packages = kconfig_hardened_check
+setup_requires = setuptools
+
+[options.entry_points]
+console_scripts = 
+	kconfig-hardened-check = kconfig_hardened_check:main
+

setup.py

+#!/usr/bin/python3
+
+from setuptools import setup
+
+setup()