Added trapping rainwater qs
Added trapping rainwater qs

Chrisgcy/interview,harshul1610/interview,mdtareque/interview,pankajbhanu/interview,allwinsr/interview,welcomenilesh/interview,mission-peace/interview,TheKingSlayer/interview,UseOnly/interview,Shekharrajak/interview,aman-iitj/interview,nadeembhati/interview,rtkasodariya/interview,chinmayakelkar/interview,prabasn/interview,lsingal/interview,rootmonty/interview,chiranjeevjain/interview,mission-peace/interview,hackerFarmaan/interview,sonamsh/interview,onlymilap/interview,kumargauravtiwary/interview,priyatransbit/interview,cvasani/interview,Shekharrajak/interview,saibimajdi/interview,rtkasodariya/interview,manish211/interview-1,sazibislam/codeAlgorithom,saviaga/interview,mission-peace/interview