Created Categories (markdown)

Categories.md

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+## Introduction
+
+Categories are a way to categorize your videos based on a set of rules. These can be ANDed or ORed, meaning you can customize the rules to your liking.
+
+## What can they do?
+
+Right now, not a *ton* of features exist for categories, but it's something that will be built upon in the future. There are two features implement currently which may make it worthwhile:
+
+* Custom file output
+  * Your categorized videos may be placed in any folder in your filesystem, so absolute paths are possible here -- and it supports youtube-dl's file output features allowing you to customize the file name to your choosing for that specific category
+* Automatic playlists
+  * If one or multiple videos exist in a category, it gets automatically created into a playlist which will show up on your home screen
+
+## Example
+
+For example, if you want a "tech" category, you can have the following ruleset:
+
+<img src="https://i.imgur.com/oTjo1NE.png" width="500">
+
+And let's say you want a custom file output for these videos, you can make it `videos/tech/%(title)s`, meaning all those videos will end up in a folder called `tech` in your `videos` folder.