Add example to solve CVP.
Add example to solve CVP.

cr-marcstevens/fplll,blowfish880/fplll,cr-marcstevens/fplll,dstehle/fplll,dstehle/fplll,cr-marcstevens/fplll,fplll/fplll,dstehle/fplll,fplll/fplll,fplll/fplll,fplll/fplll,blowfish880/fplll,shi-bai/fplll,shi-bai/fplll,cr-marcstevens/fplll,shi-bai/fplll,fplll/fplll,blowfish880/fplll,shi-bai/fplll