Added installation instructions to README
Added installation instructions to README

pki-io/testify,outrightmental/go-testify,grepory/testify,andymoon/testify,irnnr/testify,multiplay/testify,insionng/testify,hpcloud/testify,stretchr/testify,ANPez/testify,allgeek/testify,csquared/testify,ernesto-jimenez/testify,yxd-hde/testify,AnuchitPrasertsang/testify,yxd-hde/testify,yaoshipu/testify,Fiery/testify,glittershark/testify,wallclockbuilder/testify,codygibb/testify,roth1002/testify,mesosphere/testify,MCProHosting/testify,davelondon/ktest,hawx/assert,dvln/testify,embroker/testify,liudhzhyym/testify,danielchatfield/testify,brahmaroutu/testify,betable/testify,ifraixedes/testify,bmatsuo/testify,stretchr/testify