Starting splitting the doc in several pages.

docs/maps/api-chat.md

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+{.section-title.accent.text-primary}
+# API Chat functions reference
+
+### Sending a message in the chat
+
+```
+WA.chat.sendChatMessage(message: string, author: string): void
+```
+
+Sends a message in the chat. The message is only visible in the browser of the current user.
+
+*   **message**: the message to be displayed in the chat
+*   **author**: the name displayed for the author of the message. It does not have to be a real user.
+
+Example:
+
+```javascript
+WA.chat.sendChatMessage('Hello world', 'Mr Robot');
+```
+
+### Listening to messages from the chat
+
+```javascript
+WA.chat.onChatMessage(callback: (message: string) => void): void
+```
+
+Listens to messages typed by the current user and calls the callback. Messages from other users in the chat cannot be listened to.
+
+*   **callback**: the function that will be called when a message is received. It contains the message typed by the user.
+
+Example:
+
+```javascript
+WA.chat.onChatMessage((message => {
+    console.log('The user typed a message', message);
+}));
+```