Micro tweaks + badges for tickets and lists

Updated screenshot

Simplified the config

Instead of using a table on a seperate module,
configs are now loaded from the main config table
(`core.config`) and have a flat structure, having
each field's name prefixed with `memusage_`

Made installing easier

Added a `init.lua` file which requires the actual plugin file.
This enables people to painlessly cloning the repository and
having the plugin work out of the box. Cloning the repository
is useful since you can simply update by doing `git pull`.

Added comments to config example

Slight tweak to wording

Fixed the config table

Actually wrote a summary, dunno how I missed that lol

Added a config example and screenshot

Added an example screenshot

Actually wrote the proper README

And renamed the `text_color` config to just `color`.

Inital commit

At this stage, the plugin is fully functional and includes a
couple of configuration points: text color, position and if it
should start rendering on start or not.
It also includes a command to toggle the display.