message: add some urls
diff: @@ -72,6 +72,16 @@ server.post('/api/messages', (req, res) => {
  });
  ```
  +### Important URLs
  +
  +Your bot application will present several important URLs. You'll need to configure your Slack application profile with these urls.
  +
  +The messaging endpoint, which receives all events from Slack is: `https://YOURBOT/api/messages`
  +
  +The default "install" URL that triggers the oauth flow for multi-team installation is `https://YOURBOT/install`
  +
  +The oauth callback URL (or "redirect uri") that should be added to your Slack application profile is `https://YOURBOT/install/auth`
  +
  ### Multi-team Support
  In the examples above, the `SlackAdapter` constructor received a single `botToken` parameters. This binds the adapter and all API calls it makes to a single Slack workspace.
  