Add Russian-Tatar United Layout
It would be great to have a layout that behaves exactly like Russian layout but have Tatar letters in third layer on pair Russian keys. Now to type Tatar text we need to use Tatar layout that makes it not so easy to type Russian text. I mean we need not only Tatar first layout but also Russian first layout that have all Tatar letters for those who mostly use Russian language. Easy access to Tatar keys can push using Tatar language forward.
I have a merge request with the layout I want !422 (closed)
And little article about why this layout is looking so https://800147.github.io/rtu/en