Mark posts as read after viewing

[MikeSim1]

Is your feature request related to a problem? Please describe.
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• When scrolling through the feed, there's no clear indicator of which posts have already been read/viewed.

Describe the solution you'd like
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• Other reddit clients simply change the color of the text on the post you've already viewed to be either lower opacity or closer to the background color.

Describe alternatives you've considered
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• Alternatives to the above solution could be to simply hide posts, but some users (myself included) like to go back to posts and view any new comments.

Additional context
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• Most useful when browsing in thumbnail mode