Describe some public struct and func

plugin.go

@@ -34,6 +34,7 @@ type (
 		VarFiles    []string
 	}
 
+	// Netrc is credentials for cloning
 	Netrc struct {
 		Machine  string
 		Login    string

terraform.go

@@ -53,6 +53,7 @@ func downloadFile(filepath string, url string) error {
 	return nil
 }
 
+// Unzip a file to a destination
 func Unzip(src, dest string) error {
 	r, err := zip.OpenReader(src)
 	if err != nil {