For adding desktop verision and mobile version link in mobile theme you can use following module it is free module.
<a href="https://github.com/davidalger/CLS_DesignSwitcher">https://github.com/davidalger/CLS_DesignSwitcher</a>
<a href="https://github.com/davidalger/CLS_DesignSwitcher">https://github.com/davidalger/CLS_DesignSwitcher</a>