add git-it tutorial, contribution add-<username>.txt file
add git-it tutorial, contribution add-<username>.txt file

SaraHal/patchwork,ruicorte/patchwork,tanmiiti/patchwork,rkaranam/patchwork,Frankyx93/patchwork,raju249/patchwork,diegobust4545/patchwork,juliozm20/patchwork,Misatoteen/hello-world,laurenamy/patchwork,cadazab/patchwork,elzbeth/patchwork,Soumya08pragya/patchwork,joysjsj/patchwork,gtbay707/patchwork,colpac64/patchwork,carufenon/patchwork,apound01/patchwork,SarahSexton/patchwork