Add example-config.txt

[sergeevabc]

Dear @unreadablewxy,
I got inspired to try your app, read a local wiki twice, but failed to proceed further. Consider adding example-config.txt (like DSNCrypt does) adapted for some common scenario. For example, a user has C:\Downloads with a bunch of executable, text and audio files. Show how to move them to sub-folders (Bin, Docs, Media) accordingly.