That would be great! If you know other languages than english (french, german, swedish?) the translations are already well advanced, and can help you too.
If you want to start, the best way is to start with the Manual index page ( http://sourceforge.net/apps/mediawiki/f ... e_Help_Toc
). Just create a http://sourceforge.net/apps/mediawiki/f ... elp_Toc/ru
page, copy/past the contents of the english page. and adapt (for each english page you create a corresponding /ru page). After you create the first page, just tell me and I'll create the needed templates with russian flag.
Tell me if you are interested, and I'll give you edit rights on the wiki
Another thing you can do, which is easier, is to help translating freecad itself in russian by going there: http://crowdin.net/project/freecad/invite
All the freecad translation is currently hosted there, and it is very easy to use.
Any questions, feel free to ask here!