DX11 Quick installation: 
Unzip these files
http://www80.zippyshare.com/v/364irTkT/file.html

Into your (don't make a new folder): 
steamapps\common\Injustice2\Binaries\Retail

Or if you just want the .ini
http://www59.zippyshare.com/v/sE0HJ84y/file.html