Popup the device's current RefreshRate
-App that shows the current refresh rate
-Over 120 is displayed in Blue, over 90 is displayed in Green, and over 60 is displayed in Red.
-Pop-up is maintained on home key after start
-Pop-up is also closed when the app is closed

showing popup of current device RefreshRate
-It is showing refresh rate of current device dynamically.
-Color is Blue if 120, Green if 90, and Red if 60.
-Popup maintains in case user press home key after run.
-Popup would be finished if app stop.