Add info about static asset hashing in readme
Add info about static asset hashing in readme

zeppytoh/cruorgsg-fp,davenaylor/FoundationPress,randmanrjr/FoundationPress-randman,randmanrjr/FoundationPress-randman,olefredrik/FoundationPress,colin-marshall/FoundationPress,linuxbastard/FoundationPress,davenaylor/FoundationPress,linuxbastard/FoundationPress,olefredrik/FoundationPress,colin-marshall/FoundationPress,bellatl/FoundationPress,zeppytoh/cruorgsg-fp,bellatl/FoundationPress