create account for gtisza (tgr)

Full name: Gergő Tisza
Affiliation: WMF Multimedia team fulltime engineer
Contact: gtisza@wikimedia.org / tgr@freenode
Preferred shell user name: tgr

labs user: tgr
UID: 2355
cn: Gergő Tisza

manager: <+gi11es>

key: https://office.wikimedia.org/w/index.php?title=User:GTisza_%28WMF%29&diff=111915&oldid=107814

RT #7506

Change-Id: I949987b1dc3c34a950e8d3c909617e5ac7b7b14b