Table of Contents

Im not sure if im really stupid, or if this requires something special. But when uploading documentation for your plugin, how do you add a table of contents? Like the area where you can click whatever section you need, such as the one in stack size controller, or really any other plugin out there. 

Thanks in advance, and I apologize if this is a stupid question. 

Instead of one Hashtag add 2 hashtags :D

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Im gonna be honest, I feel ashamed of myself for not trying that. I apologize, and thank you very much!