Add vector field demo
Add vector field demo

ghisvail/vispy,sh4wn/vispy,srinathv/vispy,srinathv/vispy,ghisvail/vispy,julienr/vispy,sbtlaarzc/vispy,michaelaye/vispy,dchilds7/Deysha-Star-Formation,sbtlaarzc/vispy,RebeccaWPerry/vispy,jay3sh/vispy,jdreaver/vispy,jdreaver/vispy,bollu/vispy,inclement/vispy,Eric89GXL/vispy,julienr/vispy,ghisvail/vispy,sh4wn/vispy,michaelaye/vispy,QuLogic/vispy,jdreaver/vispy,Eric89GXL/vispy,QuLogic/vispy,kkuunnddaannkk/vispy,RebeccaWPerry/vispy,bollu/vispy,bollu/vispy,kkuunnddaannkk/vispy,drufat/vispy,kkuunnddaannkk/vispy,sh4wn/vispy,srinathv/vispy,Eric89GXL/vispy,jay3sh/vispy,dchilds7/Deysha-Star-Formation,michaelaye/vispy,drufat/vispy,julienr/vispy,inclement/vispy,inclement/vispy,jay3sh/vispy,dchilds7/Deysha-Star-Formation,QuLogic/vispy,sbtlaarzc/vispy,drufat/vispy,RebeccaWPerry/vispy