Added the spec PDF.
Added the spec PDF.

vertica/orc,jorgemarsal/orc,vertica/orc,jorgemarsal/orc,jorgemarsal/orc,vertica/orc,jorgemarsal/orc,vertica/orc,vertica/orc,jorgemarsal/orc,jorgemarsal/orc,jorgemarsal/orc,jorgemarsal/orc,vertica/orc,vertica/orc,vertica/orc