adding conversions Goodie

if i go to google.com and type in something like: 'pounds to kg'
it gives me what in DDG would be an instant answer, in the form of a drop-down.

this is a first attempt at recreating that as a Goodie, using all the same terms google uses in said drop-down.  there is something like this already, presumably a Spice (uses Wolfram Alpha) ... this is probably faster than using the WA API.