How do you greet someone in Qatar for Ramadan?
How do I wish Ramadan Mubarak?
Ramadan Mubarak to you and your family!
Warm wishes to you on the occasion of Ramadan.
Sending greetings your way this Ramadan.
Ramadan Mubarak! 
Wishing you a month filled with blessings. 
I wish Allah showers His blessings upon you and your family this Ramadan.