Add doc.go at the root of the repo (#4)
Add doc.go at the root of the repo (#4)

Add a doc.go file at the root of the repo that describes the purpose of
the repo.  Without this file, users will see an error when they run go
get on the root of the repo:

~$ go get github.com/brkt/vmware
package github.com/brkt/vmware: no buildable Go source files in
/tmp/go/src/github.com/brkt/vmware
brkt/vmware