doc: added beginner's guide
doc: added beginner's guide

wanderine/nipype,Leoniela/nipype,sgiavasis/nipype,gerddie/nipype,blakedewey/nipype,iglpdc/nipype,carolFrohlich/nipype,JohnGriffiths/nipype,arokem/nipype,dmordom/nipype,sgiavasis/nipype,arokem/nipype,mick-d/nipype_source,mick-d/nipype,gerddie/nipype,arokem/nipype,fprados/nipype,carlohamalainen/nipype,grlee77/nipype,blakedewey/nipype,FredLoney/nipype,glatard/nipype,FredLoney/nipype,carlohamalainen/nipype,glatard/nipype,JohnGriffiths/nipype,sgiavasis/nipype,iglpdc/nipype,fprados/nipype,carolFrohlich/nipype,mick-d/nipype,dgellis90/nipype,JohnGriffiths/nipype,carlohamalainen/nipype,iglpdc/nipype,FCP-INDI/nipype,mick-d/nipype,rameshvs/nipype,Leoniela/nipype,Leoniela/nipype,rameshvs/nipype,iglpdc/nipype,pearsonlab/nipype,pearsonlab/nipype,pearsonlab/nipype,grlee77/nipype,dgellis90/nipype,dmordom/nipype,arokem/nipype,FCP-INDI/nipype,carolFrohlich/nipype,fprados/nipype,JohnGriffiths/nipype,glatard/nipype,gerddie/nipype,FredLoney/nipype,FCP-INDI/nipype,gerddie/nipype,christianbrodbeck/nipype,wanderine/nipype,dmordom/nipype,dgellis90/nipype,carolFrohlich/nipype,rameshvs/nipype,grlee77/nipype,mick-d/nipype_source,blakedewey/nipype,mick-d/nipype,blakedewey/nipype,wanderine/nipype,rameshvs/nipype,dgellis90/nipype,wanderine/nipype,christianbrodbeck/nipype,sgiavasis/nipype,grlee77/nipype,FCP-INDI/nipype,mick-d/nipype_source,glatard/nipype,pearsonlab/nipype