Add pretty printing example to introduction docs
Add pretty printing example to introduction docs

bvenn/BioFSharp,HLWeil/BioFSharp,CSBiology/BioFSharp,bvenn/BioFSharp,HLWeil/BioFSharp,CSBiology/BioFSharp,bvenn/BioFSharp,muehlhaus/BioFSharp,HLWeil/BioFSharp,HLWeil/BioFSharp