Update README.md with Transaction example
Update README.md with Transaction example

- add a more detailed slightly more realistic example for a transaction.

senseobservationsystems/gorm,nkovacs/gorm,gernest/ngorm,NOX73/gorm,senseobservationsystems/gorm,ModelRocket/gorm,unravelin/gorm,ivpusic/gorm,trigrass2/gorm,lscieux/gorm,jinzhu/gorm,javierprovecho/gorm,ulule/gorm,sidorenko-ruslan/gorm,andviro/gorm,arthurpro/gorm,KevinSjoberg/gorm,jaytaylor/gorm,aperera/gorm,d4l3k/gorm,armiller/gorm,liudanking/gorm,bpizzi/gorm,kimiby/gorm,andviro/gorm,jmptrader/gorm,sunfmin/gorm,KevinSjoberg/gorm,bpizzi/gorm,d4l3k/gorm,aspcartman/gorm,nkovacs/gorm,sdhjl2000/gorm,unravelin/gorm,OscaRoa/gorm,seatgeek/gorm,jinzhu/gorm,sunfmin/gorm,Acidburn0zzz/gorm,ngorm/ngorm,Acidburn0zzz/gorm,ch3lo/gorm,arthurpro/gorm,seatgeek/gorm,sulnedinfind/gorm,postmates/gorm,pariz/gorm,acdgfh/gorm,ch3lo/gorm,jaytaylor/gorm,trigrass2/gorm,NOX73/gorm,ulule/gorm,ivpusic/gorm,javierprovecho/gorm,wallclockbuilder/gorm,kimiby/gorm,lscieux/gorm,kiwih/gorm,armiller/gorm,postmates/gorm,aspcartman/gorm,jmptrader/gorm,ilgooz/gorm,sidorenko-ruslan/gorm,yibin001/gorm,Twister915/gorm,pariz/gorm,ModelRocket/gorm,ilgooz/gorm,sdhjl2000/gorm,aperera/gorm,kiwih/gorm,OscaRoa/gorm,wallclockbuilder/gorm,liudanking/gorm,sulnedinfind/gorm,awakenetworks/gorm,acdgfh/gorm,awakenetworks/gorm,Twister915/gorm,yibin001/gorm