add reproject/crop example
add reproject/crop example

mpgerlek/PDAL-old,jwomeara/PDAL,mtCarto/PDAL,jwomeara/PDAL,radiantbluetechnologies/PDAL,lucadelu/PDAL,radiantbluetechnologies/PDAL,mtCarto/PDAL,verma/PDAL,boundlessgeo/PDAL,mtCarto/PDAL,radiantbluetechnologies/PDAL,verma/PDAL,mtCarto/PDAL,verma/PDAL,Sciumo/PDAL,verma/PDAL,Sciumo/PDAL,mpgerlek/PDAL-old,Sciumo/PDAL,lucadelu/PDAL,mpgerlek/PDAL-old,jwomeara/PDAL,verma/PDAL,boundlessgeo/PDAL,DougFirErickson/PDAL,Sciumo/PDAL,radiantbluetechnologies/PDAL,boundlessgeo/PDAL,lucadelu/PDAL,verma/PDAL,mpgerlek/PDAL-old,DougFirErickson/PDAL,boundlessgeo/PDAL,lucadelu/PDAL,jwomeara/PDAL,DougFirErickson/PDAL,DougFirErickson/PDAL,verma/PDAL