Implementation of CATEGORIES property to organize and color events

[Moppko]

Checklist

• I made sure that there are no existing issues - open or closed - to which I could contribute my information.
• I made sure that there are no existing discussions - open or closed - to which I could contribute my information.
• I have read the FAQs inside the app (Menu -> About -> FAQs) and my problem isn't listed.
• I have taken the time to fill in all the required details. I understand that the request will be dismissed otherwise.
• This issue contains only one feature request.
• I have read and understood the contribution guidelines.

Feature description

The event type currently only allows for one type per synched calendar. This makes managing calendars that already include categories for different events quite difficult.
It would be great to have the possibility to create categories so that imported events containing information for the CATEGORIES property show up in the corresponding category and colour. Also the other way around the app should be able to store the category of an event in a way that it transfers to other apps that use the CATEGORIES property.

Why do you want this feature?

When synching calendars between android and windows there is a problem with proper organization of event types. All the android calendar apps I have tried use the COLOR (or some other, customized) property to set the color for an event, while Thunderbird, the pretty much only reasonable option for CalDAV on windows, uses the CATEGORIES property.
I am not a developer by any means and have already been told by @naveensingh that there is no standardized way in android to do this, so I don't fully understand how much of a pain in the ass this would be to implement. Still I believe that it could be worth it, considering that offering the possibility to read and write categories for events in fossify calendar would give the app a unique and useful feature for organization of events as well as synchronisation with other clients, that no other android calendar app seems to offer at the moment.

Additional information

No response