Add continue from where you left off

[BabySkinHat]

Other versions of 4chan X let you go back to thread and resume from where you left off. It's a very useful feature and I and other people would appreciate it if you could include it in this version. If this is already included and there's an option to turn it on and off, please call me a retard but explain where it is. Thank you.

[loadletter]

Oh, I forgot about this, it needs a bit of work before being added https://github.com/loadletter/4chan-x/issues/63#issuecomment-68316362