Add docstrings for the modules

kconfig_hardened_check/__about__.py

+"""
+Version
+"""
+
 __version__ = '0.6.1'

kconfig_hardened_check/__init__.py

 #!/usr/bin/python3
 
-# This tool helps me to check Linux kernel options against
-# my security hardening preferences for X86_64, ARM64, X86_32, and ARM.
-# Let the computers do their job!
-#
-# Author: Alexander Popov <alex.popov@linux.com>
-#
-# Please don't cry if my Python code looks like C.
 
 # pylint: disable=missing-module-docstring,missing-class-docstring,missing-function-docstring
 # pylint: disable=line-too-long,invalid-name,too-many-branches,too-many-statements
+"""
+This tool helps me to check Linux kernel options against
+my security hardening preferences for X86_64, ARM64, X86_32, and ARM.
+Let the computers do their job!
+
+Author: Alexander Popov <alex.popov@linux.com>
+
+This module performs input/output.
+"""
+
 
 import sys
 from argparse import ArgumentParser

kconfig_hardened_check/checks.py

 #!/usr/bin/python3
 
+"""
+This tool helps me to check Linux kernel options against
+my security hardening preferences for X86_64, ARM64, X86_32, and ARM.
+Let the computers do their job!
+
+Author: Alexander Popov <alex.popov@linux.com>
+
+This module contains knowledge for checks.
+"""
+
 # N.B. Hardening sysctls:
 #    kernel.kptr_restrict=2 (or 1?)
 #    kernel.dmesg_restrict=1 (also see the kconfig option)

kconfig_hardened_check/engine.py

 #!/usr/bin/python3
 
+"""
+This tool helps me to check Linux kernel options against
+my security hardening preferences for X86_64, ARM64, X86_32, and ARM.
+Let the computers do their job!
+
+Author: Alexander Popov <alex.popov@linux.com>
+
+This module is the engine of checks.
+"""
+
 # pylint: disable=missing-module-docstring,missing-class-docstring,missing-function-docstring
 # pylint: disable=line-too-long,invalid-name,too-many-branches,too-many-statements