add vertical text rotation patch

User-patches.md

@@ -40,6 +40,7 @@ The following list will show available patches with their `name`; `function`; `c
 * [2-no-keyboard-shortcuts.lua](https://gist.github.com/zwim/e5f9a12922f645fdf390faaadfeb5ac7); Disable keyboard shortcuts on devices with keyboard (like the emulator); download.
 * [2-limit-crashlog-size.lua](https://gist.github.com/zwim/9896498977c8eeb679b516059e752de7); Limits the size of the `crash.log` file (if available on the platform), can be of interest when verbose debugging is enabled; download.
 * [2-custom-sort.lua](https://gist.github.com/wfdewith/978e4f8e09f481a480cb1bf645e8d518); An example of what you can do with custom file sorting algorithms; download.
+* [2-cre-rotate-japanese-book.lua](https://gist.githubusercontent.com/equwal/28561ed2b44e28989291a9ca367422fc/raw/c20b9987f1fad6964966a0878b9b99c153d39fea/2-cre-rotate-japanese-book.lua); Formats books vertically for Japanese, Chinese etc. The fonts are not rotated -- you need to rotate the font itself. This is usually done with fontforge. Here is a script that can do it: [tategakifont](https://github.com/MyK00L/tategakifont). This solution is hacky and user edits to the patch are recommended. [Source issue #11469](https://github.com/koreader/koreader/issues/11469).
 
 ## Device specific