Add design doc to CONTRIBUTING document
Add design doc to CONTRIBUTING document

rnpandya/adam,FusionWorks/adam,gazimahmud/adam,FusionWorks/adam,rnpandya/adam,massie/adam,erictu/adam,VinACE/adam,gazimahmud/adam,VinACE/adam,FusionWorks/adam,allenday/adam,SwathiMystery/adam,kcompher/adam,heuermh/adam,massie/adam,bigdatagenomics/adam,rnpandya/adam,erictu/adam,FusionWorks/adam,massie/adam,laserson/adam,tomwhite/adam,massie/adam,bigdatagenomics/adam,laserson/adam,VinACE/adam,heuermh/adam,tdanford/adam,rnpandya/adam,heuermh/adam,laserson/adam,tomwhite/adam,SwathiMystery/adam,kcompher/adam,SwathiMystery/adam,allenday/adam,allenday/adam,SwathiMystery/adam,tomwhite/adam,heuermh/adam,tdanford/adam,gazimahmud/adam,VinACE/adam,laserson/adam,tdanford/adam,allenday/adam,bigdatagenomics/adam,erictu/adam,gazimahmud/adam,erictu/adam,tdanford/adam,kcompher/adam,bigdatagenomics/adam,tomwhite/adam,kcompher/adam