Prepare a computer with windows 7 64 bit ( Admin privileges ) and install lenovo usb drivers from here : https://www.dropbox.com/s/o2pvhpk5fmk5xgn/Lenovo_Usb_Driver-1.0.8.rar
Download vroot on your computer : https://www.dropbox.com/s/x69bug2vr9ezw81/VRoot_184.108.40.20663_english_cid1005_7337ba1e_89.exe
Open it and after that connect your smartphone ( be sure to check usb debugging mode on the phone )
Do not install the recovery from the first link ... it does not work on lenovo a708t .
Recommended : install aptoide ( it is a similar google play application ) . Just go to m.aptoide.com ( from your phone ) and install the apk .
In order to install google play after you root-ed the phone, you need to do the followings
Check the link http://forum.xda-developers.com/showthread.php?t=1874285 and http://forum.xda-developers.com/showthread.php?t=1874285&page=2 :
The idea is simple : unzip the archive below, open root explorer ( download it from aptoide ) , mount r/w the system/app , copy the apk here , reboot the phone . Simple.
Thanks Gorelk, those gapps works perfectly now I can use play store I also add GoogleCalendarSyncAdapter.apk and GoogleContactsSyncAdapter.apk and can sync too also I'll upload the apks Gapps CalendarSync ContactSync.