BriteBlu - 'Mark as Read' Joomla component

Simple Joomla plugin to enable users to mark articles as 'read'.

About

BriteBlu adds functionality to Joomla (versions 3.9.x)

There have been Joomla users in the past years asking if a functionality like this exists:

Mark a group of articles (place these articles in a category or add a tag to them).
Have logged in users read these articles from a page marked as 'important stuff' or 'must read items'.
Offer each logged-in user the ability to 'mark' an article as 'read' (or even 'partly read', as extra options) which will then remove the article from this page listing.
Upon login this page with 'important stuff' will show the respective user, which articles still need to be read and subsequently marked as 'read'.

This component should fulfill this functionality in a satisfying way.

Received future feature requests:

Send notification to admin when all items for a user have been marked as 'read'.
Send notification to user when new 'unread' articles within the category (or added tag) are available.

Questions on behavior and details of this component can be sent to BriteBlu.

TODO

...

Added debug option in plugin configuration
Some cleanup in main plugin file (added doc comments, renamed private method, etc)
Added js and css folders and files
Added frontend plugin template tmpl/read.php
Changed debug option from list select to radio button group
Added pkg_markasread.xml package manifest file
Added boilerplate package installer script
Added publish.yml workflow to publish Joomla package archive when commit gets tagged

Changed directory structure for project to house plugin and component in seperate folders

Set minimum Joomla version for markasread plugin from 3.8 to 3.1
Renamed markasread.xml to manifest.xml
Renamed plugin
First implementation of markasread plugin logic to determine if article was read