[styleguide] Style Guide

# Summary

Styleguide module provides a visual testing page for Drupal themes.

Discussion about the port and previous port efforts can be found at: #2061293: Port Style Guide module to Drupal 8

# Project URL

https://www.drupal.org/project/styleguide

# Where is the code?

https://github.com/Shdulin/styleguide

# Estimated completion date

To be determined

# Dependencies

None.

# Who's doing the port?

Ported by Oleksiy, mentored by Sutharsan

# What help do they need?

Feel free to test the module.
As long as there is no release of this module, you can report issues in the Github repo at: https://github.com/Shdulin/styleguide/issues

# D8 roadmap

To be determined

# Background and reference information

#2061293: Port Style Guide module to Drupal 8