Update README.md

README.md

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 # Slack Notifier
 
-**Slack Notifier** sends notifications and messages to [Slack](https://slack.com/) service using web hooks. It can be used both on the server (Node.js) and the client-side (Browser).
+**Slack Notifier** sends notifications and messages to [Slack](https://slack.com/) service using Incoming Webhook. It can be used both on the server (Node.js) and the client-side (Browser).
+
+It is basically designed for notification messages, not support file attachment yet. You may also use this for error reporting purpose for your production environment because
+
+- error stack is sent in code format when an Error object is thrown to the `send()` method.
+- you can turn on/off the service globally as the `enabled` option can be given through the `configure()` method.
+
+## Install with npm
+
+    npm install slack-notifier --save
+
+## Install with bower
+
+    bower install slack-notifier --save
+
+## Usage
+
+Check the example files:
+
+- Node.js: [/example/server.js](https://github.com/cithukyaw/slack-notifier/blob/master/example/server.js)
+- Browser: [/example/client.html](https://github.com/cithukyaw/slack-notifier/blob/master/example/client.html)
+
+## License
+Released under the [MIT License](LICENSE).