readme: add additional info about rutube

README.md

@@ -47,6 +47,7 @@ this list is not final and keeps expanding over time. if support for a service y
 | instagram  | supports reels, photos, and videos. lets you pick what to save from multi-media posts.                               |
 | pinterest  | supports photos, gifs, videos and stories.                                                                           |
 | reddit     | supports gifs and videos.                                                                                            |
+| rutube     | supports yappy & private links.                                                                                      |
 | soundcloud | supports private links.                                                                                              |
 | tiktok     | supports videos with or without watermark, images from slideshow without watermark, and full (original) audios.      |
 | twitter/x  | lets you pick what to save from multi-media posts. may not be 100% reliable due to current management.               |