install go and Hello World Program
https://golangbyexample.com/workspace-hello-world-golang/
it is now time to set up the workspace for go and run our first go hello world program
GO Workspace
go env variables
$go env
GOROOT
It is the location of your GO SDK.
go env|grep GOROOT
GOROOT="/usr/local/go"
GOPATH
Before GO version 1.13
With Go version 1.13 or later
