Add livechat events

6. Developer Guides/Livechat API/README.md

@@ -34,3 +34,87 @@ RocketChat(function() {
 });
 ```
 
+### Events
+
+#### _onChatMaximized_
+Fired when the chat widget is maximized.
+
+```javascript
+RocketChat(function() {
+    this.onChatMaximized(function() {
+        // do whatever you want
+        console.log('chat widget maximized');
+    });
+});
+```
+
+#### _onChatMinimized_
+Fired when the chat widget is minimized.
+
+```javascript
+RocketChat(function() {
+    this.onChatMinimized(function() {
+        // do whatever you want
+        console.log('chat widget minimized');
+    });
+});
+```
+
+#### _onChatStarted_
+Fired when the chat is started (the first message was sent).
+
+```javascript
+RocketChat(function() {
+    this.onChatStarted(function() {
+        // do whatever you want
+        console.log('chat started');
+    });
+});
+```
+
+#### _onChatEnded_
+Fired when the chat is ended either by the agent or the visitor.
+
+```javascript
+RocketChat(function() {
+    this.onChatEnded(function() {
+        // do whatever you want
+        console.log('chat ended');
+    });
+});
+```
+
+#### _onPrechatFormSubmit_
+Fired when the pre-chat form is submitted.
+
+```javascript
+RocketChat(function() {
+    this.onPrechatFormSubmit(function(data) {
+        // data is an object containing the following fields: name, email and deparment (the department _id)
+
+        // do whatever you want
+        console.log('pre-chat form submitted');
+    });
+});
+```
+
+#### _onOfflineFormSubmit_
+Fired when the offline form is submitted.
+
+```javascript
+RocketChat(function() {
+    this.onOfflineFormSubmit(function(data) {
+        // data is an object containing the following fields: name, email and message
+
+        // do whatever you want
+        console.log('offline form submitted');
+    });
+});
+```
+
+## Change Log
+| Version | Description |
+| :--- | :--- |
+| 0.53.0 | Added callback events and the ability to pass a flag to `setCustomField` so the value passed does not get wrote if there is already an existing value. |
+| 0.36.0 | Added `setTheme` method |
+| 0.26.0 | Added `setCustomField` method |