Added README.
Added README.

hazendaz/assertj-core,lpandzic/assertj-core,ChrisA89/assertj-core,mariuszs/assertj-core,michal-lipski/assertj-core,joel-costigliola/assertj-core,AlexBischof/assertj-core,assertj/assertj-core,joel-costigliola/assertj-core,xasx/assertj-core,Turbo87/assertj-core,hazendaz/assertj-core,lpandzic/assertj-core,pimterry/assertj-core,mdecourci/assertj-core,pimterry/assertj-core,nkoder/assertj-core,bric3/assertj-core,xasx/assertj-core,Turbo87/assertj-core,alexruiz/fest-assert-2.x,mariuszs/assertj-core,AlexBischof/assertj-core,dorzey/assertj-core,ChrisA89/assertj-core,bric3/assertj-core,mdecourci/assertj-core,michal-lipski/assertj-core,ChrisCanCompute/assertj-core,dorzey/assertj-core,ChrisCanCompute/assertj-core,nkoder/assertj-core,assertj/assertj-core