readme is updated with frame.htm instructions

README.md

@@ -2,10 +2,12 @@
 Сross-browser presentation template
 
 * Open [pepelsbey.github.com/shower](http://pepelsbey.github.com/shower/)
-* Switch browser to fullscreen mode or press play button to enter presentation mode
+* Switch your browser to fullscreen mode or press play button to enter presentation mode
 * Press `→` to navigate
 * Press `Esc` to exit presentation mode
 
+If you want to test your presentation in different resolutions open [frame.htm](http://pepelsbey.github.com/shower/frame.htm) and switch between tabs.
+
 ## Supported Browsers
 
 Desktop platforms: