Mark a file as reviewed/done/inspected

Hello JetBrains Team and Community,

I was using Visual Studio and Visual Studio Code for years now. Currently I try to switch my IDE to Rider and I know Rider only a few days and found most of the settings I need. 

What I am missing is the ability to mark a file (mostly a C# Class) as done. Normally I write many classes at the same time to get a better feeling of my design. I am refactoring and redisigning code all the time, but at some point I am sure, thats it.

At this time I do a final Review, add the source code documentation and some comments to remember in a few years. Now the C# class, interface or other files reached „my“ stage final and I would like to mark the file with an Icon, checkmark, color or something else, something Like this: https://marketplace.visualstudio.com/items?itemName=vquelque.markfiles

I would Like to prevent opening each file to see if the file contains a comment Like „REVIEWED“. The most  convenient way would be to see it directly within the solution tree. 

Kind Regards, Dieter