add nikiforovall/dotfiles repository to index.md
add nikiforovall/dotfiles repository to index.md

dotfiles/dotfiles.github.com,unixorn/dotfiles.github.com,dotfiles/dotfiles.github.com,unixorn/dotfiles.github.com,unixorn/dotfiles.github.com,dotfiles/dotfiles.github.com,dotfiles/dotfiles.github.com,unixorn/dotfiles.github.com,unixorn/dotfiles.github.com,dotfiles/dotfiles.github.com