Update ReadME.md (#46)
Update ReadME.md (#46)

Fixed the broken contributing.md link in the ReadME.md file
cforlando/PetAdoption-API,cforlando/PetAdoption-API,khalidhoffman/PetAdoption-API,khalidhoffman/PetAdoption-API,khalidhoffman/PetAdoption-API,cforlando/PetAdoption-API