Create messaging.md

doc/help/messaging.md

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+# Messaging
+
+## Writing Messages
+
+You can write messages using the input box with the text "Write a message..." at the bottom of Mattermost. 
+
+Press **ENTER** to send a message. Use **Ctrl+ENTER** to create a new line without sending a message. 
+
+## Formatting Messages
+
+Mattermost messages are formatted using a standard called "markdown". Here are examples: 
+
+| Text Entered | How it appears |
+|:---------------|:---------------|
+|`**bold**`| **bold** |   
+| `_italic_`|_italic_|
+|`[hyperlink](http://mattermost.org)`|[hyperlink](http://mattermost.org)|
+|`![embedded image](https://travis-ci.org/mattermost/platform.svg)`|![embedded image](https://travis-ci.org/mattermost/platform.svg)|
+
+## Mentioning Teammates
+
+You can mention a teammate by using the `@` symbol plus their username to send them a special notification to draw their attention. 
+
+For example, you might write: 
+
+```
+@alice how did your interview go with the new candidate?
+``` 
+
+Which sends a special mention notification to **alice** to check your message. 
+
+To mention a teammate, press `@` and you should see a list of team members who can be messaged. You can either type their username or use the **Up** and **Down** arrow keys and then **ENTER** to select them to be mentioned. 
+
+You can configure how you'd like to be alerted about mentions of your username, your first name, your nickname, or other keywords from **Account Settings** > **Notifications** and you can set channel-specific preferences from **[Channel Name]** > **Notification Preferences**