Install go runtime protoc-gen-go with each folder(eg. user and transaction)
go install google.golang.org/protobuf/cmd/protoc-gen-go@latest
Install depedencies grpc library
go get -u google.golang.org/grpc@v1.26.0
Run this command below for each folder
go mod download
Run application within inside 2 folder
go run cmd/main.go -config=config/.env