Added an easy recipe for Paella mixta

I’ve really taken to paella since moving to Spain.  Previously i’d never go near that much wierdly coloured wobbley seafood stuff.  But after a few years and some really tasty meals I’ve been converted.  Anyway here’s my version of Paella mixta, that’s paella with seafood and chicken.  It’s based on books, my taste and our friend’s mum’s secret recipe. Check it out here.