Updated placeholder and instructions

assets/js/components/Options.jsx

@@ -146,7 +146,8 @@ var Options = React.createClass({
                   handleChange={that._updateWhitelistState}
                   label="Whitelist"
                   sites={that.state.whitelist}
-                    helpText="Sites that you want to show in your reports." />
+                  placeholder="http://google.com
http://myproject.com@@MyProject"
+                  helpText="Sites that you want to show in your reports. You can assign URL to project by adding @@YourProject at the end of line." />
             );
 
         };