updated examples/farm/README.md
updated examples/farm/README.md

akhikhl/gretty,cwardgar/gretty,akhikhl/gretty,cwardgar/gretty,saladinkzn/gretty,cwardgar/gretty,aya-eiya/gretty,WilliamRen/gretty,akhikhl/gretty