Deprecate in favour of @types/yandex-maps

[Alexander Kachkaev]

I'd be nice to add a link to @types/yandex-maps in README.md and GitHub project description. This would save new visitors from confusion.

E.g.:

Warning: This project is deprecated in favour of @types/yandex-maps (source)

Markdown for README.md

> **Warning:** This project is deprecated in favour of [@types/yandex-maps](https://www.npmjs.com/package/@types/yandex-maps) ([source](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/master/types/yandex-maps))

Raw text for project description

Deprecated in favour of https://www.npmjs.com/package/@types/yandex-maps

Many thanks for crafting Yandex Maps typings!

[Alexander Kachkaev]

ping @Delagen :)

[Sergey Vohmyanin]

Please make a PR, i am at holidays till 11 jan.

[Alexander Kachkaev]

See #5