added readme translation into Russian

[NFFY88]

• README.ru.md file created in ./doc/i18n/ directory
• All content accurately translated to Russian
• Format and styling match the original English version exactly
• All links and references are functional
• Translation reviewed by a native Russian speaker (if possible)
• Update project documentation or configuration to include the new Russian README (if necessary)

closes #669

[CLAassistant]

All committers have signed the CLA.

[jelveh]

Thank you very much for the contribution. Also, thanks for adding the link as well 👐