License of an Addon on the main path

Hello!

So I installed an addon and saw that it made a license, readme and so on on the main folder. At the moment I didn't had those files there since I'm still very early on the game but shouldn't this files be inside the addon folder instead of the whole project?

The addon is as simple as check for the TODO on the comments but I want to do this properly. Where should I move this files of the addon? Or my License would substitute the one there if it's stronger?

Thanks!