Added quasardb to the USERS.md file
Added quasardb to the USERS.md file

facebook/rocksdb,hobinyoon/rocksdb,wenduo/rocksdb,SunguckLee/RocksDB,wat-ze-hex/rocksdb,flabby/rocksdb,jalexanderqed/rocksdb,vmx/rocksdb,flabby/rocksdb,vmx/rocksdb,bbiao/rocksdb,wenduo/rocksdb,wenduo/rocksdb,vmx/rocksdb,hobinyoon/rocksdb,tsheasha/rocksdb,norton/rocksdb,wenduo/rocksdb,SunguckLee/RocksDB,bbiao/rocksdb,tsheasha/rocksdb,vmx/rocksdb,ryneli/rocksdb,wat-ze-hex/rocksdb,ryneli/rocksdb,flabby/rocksdb,norton/rocksdb,flabby/rocksdb,ryneli/rocksdb,jalexanderqed/rocksdb,OverlordQ/rocksdb,wat-ze-hex/rocksdb,SunguckLee/RocksDB,jalexanderqed/rocksdb,tsheasha/rocksdb,SunguckLee/RocksDB,bbiao/rocksdb,wat-ze-hex/rocksdb,wat-ze-hex/rocksdb,hobinyoon/rocksdb,Andymic/rocksdb,norton/rocksdb,bbiao/rocksdb,Andymic/rocksdb,bbiao/rocksdb,OverlordQ/rocksdb,tsheasha/rocksdb,tsheasha/rocksdb,Andymic/rocksdb,norton/rocksdb,flabby/rocksdb,vmx/rocksdb,hobinyoon/rocksdb,Andymic/rocksdb,Andymic/rocksdb,OverlordQ/rocksdb,facebook/rocksdb,jalexanderqed/rocksdb,tsheasha/rocksdb,hobinyoon/rocksdb,SunguckLee/RocksDB,facebook/rocksdb,vmx/rocksdb,facebook/rocksdb,jalexanderqed/rocksdb,vmx/rocksdb,hobinyoon/rocksdb,OverlordQ/rocksdb,flabby/rocksdb,wenduo/rocksdb,jalexanderqed/rocksdb,wenduo/rocksdb,wat-ze-hex/rocksdb,wenduo/rocksdb,OverlordQ/rocksdb,bbiao/rocksdb,SunguckLee/RocksDB,facebook/rocksdb,OverlordQ/rocksdb,norton/rocksdb,OverlordQ/rocksdb,ryneli/rocksdb,vmx/rocksdb,tsheasha/rocksdb,norton/rocksdb,facebook/rocksdb,Andymic/rocksdb,Andymic/rocksdb,wat-ze-hex/rocksdb,hobinyoon/rocksdb,ryneli/rocksdb,facebook/rocksdb,hobinyoon/rocksdb,facebook/rocksdb,bbiao/rocksdb,SunguckLee/RocksDB,wat-ze-hex/rocksdb,norton/rocksdb,SunguckLee/RocksDB,bbiao/rocksdb,flabby/rocksdb,norton/rocksdb,jalexanderqed/rocksdb,ryneli/rocksdb,wenduo/rocksdb,ryneli/rocksdb,tsheasha/rocksdb,Andymic/rocksdb