Able to add a Sidenote/note on a content.

[iAdesanyaDaniel]

Checklist

• I made sure that there are no existing issues - open or closed - which I could contribute my information to.
• I have read the FAQ and my problem isn't listed.
• I'm aware that this is a request for NewPipe itself and that requests for adding a new service need to be made at NewPipeExtractor.
• I have taken the time to fill in all the required details. I understand that the feature request will be dismissed otherwise.
• This issue contains only one feature request.
• I have read and understood the contribution guidelines.

Feature description

To explain further.
Practically I could be watching a YouTube video, and want to take some notes personally on the video.

Why do you want this feature?

If the comment feature were available, it could have worked. But due to privacy and the principle of this beautiful app, the comment feature would not be available.

Additional information

It would be useful to be able to take a Sidenote on content, that we can later access.