Update docs

Author: Alexey Efimov

README.md

@@ -26,7 +26,8 @@ If you using shortcut, then OmniBar will think what you not needed to use your d
 _Default Search Engine_ and will search for shortcut in all other.
 
 ##Installation
-Download [OmniBar.safariextz](https://github.com/downloads/aefimov/omnibar/OmniBar.safariextz) and then open it with Safari.
+Go to [Safari Extensions](https://extensions.apple.com), select Search Tools and find OmniBar, then press Install button.
+Or download [OmniBar.safariextz](https://github.com/downloads/aefimov/omnibar/OmniBar.safariextz) and then open it with Safari.
 
 ##Safari 6.x
 Since Safari 6 have omnibar on board, this extension maybe obsolete and you can remove it