Modify readme to include async execution
Modify readme to include async execution

luismcl/crossdata,hdominguez1989/Crossdata,hdominguez1989/Crossdata,gserranojc/Crossdata,pfcoperez/crossdata,ccaballe/crossdata,gserranojc/Crossdata,compae/Crossdata,jjlopezm/crossdata,compae/Crossdata,ccaballe/crossdata,Stratio/crossdata,pmadrigal/Crossdata,jjlopezm/crossdata,luismcl/crossdata,Stratio/crossdata,pmadrigal/Crossdata,pfcoperez/crossdata,darroyocazorla/crossdata,miguel0afd/crossdata,miguel0afd/crossdata,darroyocazorla/crossdata