Created Find a file (markdown)

Find-a-file.md

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+KOReader can search a book by filename on your device via main menu `Search` - `Find a file`.
+
+You can search in the current folder or in the Home folder.
+Subfolders are included.
+
+If you have enabled `Show hidden files` in the filebrowser settings, search results will include hidden files.
+
+If you have enabled `Show unsupported files` in the filebrowser settings, search results will include unsupported files.
+
+If you search for `*` ([single asterisk](https://github.com/koreader/koreader/pull/7362)), search results will show all files.
+
+Search string can include special characters in accordance with the [Lua patterns](https://www.lua.org/pil/20.2.html).
+
+You can open a supported file directly from the search results window with a tap.