Print feedback before creating an organization on signup

Without this, it was not clear that the command was busy and it
might look like the prompt did not accept the ENTER pressed.

Author: SimonBarendse

internals/secrethub/signup.go

@@ -212,8 +212,11 @@ func (cmd *SignUpCommand) Run() error {
 				return err
 			}
 		}
+		fmt.Fprintln(cmd.io.Stdout(), "Creating your shared workspace...")
+		cmd.progressPrinter.Start()
 
 		_, err := client.Orgs().Create(cmd.org, cmd.orgDescription)
+		cmd.progressPrinter.Stop()
 		if err == api.ErrOrgAlreadyExists {
 			fmt.Fprintf(cmd.io.Stdout(), "The workspace %s already exists. If it is your organization, ask a colleague to invite you to the workspace. You can also create a new one using `secrethub org init`.\n", cmd.org)
 		} else if err != nil {