Docs for livechat queue endpoint (#1476)

* Docs for livechat queue endpoint

* Update livechat queue endpoint docs

* Fix version

developer-guides/rest-api/livechat/README.md

@@ -27,6 +27,7 @@ Manage Livechat related data:
 | `/api/v1/livechat/messages.history/:rid` | `GET` | Load Livechat messages history. | [info](message/index.html#load-livechat-messages-history) |
 | `/api/v1/livechat/offline.message` | `POST` | Send a new Livechat offline message. | [info](message/index.html#send-a-new-livechat-offline-message) |
 | `/api/v1/livechat/rooms` | `GET` | Retrieves a list of livechat rooms.  | [info](rooms/)  |
+| `/api/v1/livechat/queue` | `GET` | Retrieves a list of queued chats. | [info](queue) |
 | `/api/v1/livechat/room` | `GET` | Get the Livechat room data or open a new room. | [info](room/index.html) |
 | `/api/v1/livechat/room.close` | `POST` | Close a Livechat room. | [info](room/index.html#close-livechat-room) |
 | `/api/v1/livechat/room.transfer` | `POST` | Transfer a Livechat room to another agent or department. | [info](room/index.html#transfer-livechat-room) |

developer-guides/rest-api/livechat/queue/README.md

@@ -0,0 +1,68 @@
+# Livechat Queue
+
+## List queued chats
+
+Get the queued chats. It supports the [Offset, Count, and Sort Query Parameters](../../offset-and-count-and-sort-info/).
+
+| URL | Requires Auth | HTTP Method |
+| :--- | :--- | :--- |
+| `/api/v1/livechat/queue` | `yes` | `GET` |
+
+## Query params
+
+| Argument | Example | Required | Description |
+| :--- | :--- | :--- | :--- |
+| `includeOfflineAgents` | `true` | Optional | Whether include offline agents or not. |
+| `agentId` | `aobEdbYhXfu5dsd9` | Optional | The agent's id. |
+| `departmentId` | `3n2kj3n2j3fu5hkeqG` | Optional | The department's id. |
+
+## Example Call
+
+```bash
+curl -H "X-Auth-Token: 9HqLlyZOugoStsXCUfD_0YdwnNnunAJF8V47U3QHXSq" \
+     -H "X-User-Id: aobEdbYhXfu5hkeqG" \
+     http://localhost:3000/api/v1/livechat/queue?includeOfflineAgents=true
+```
+
+## Example Result
+
+```json
+{
+    "queue": [
+    {
+      "chats": 1,
+      "user": {
+        "_id": "CaevAPDbXN252kyXa",
+        "username": "marcos.defendi",
+        "status": "online"
+      },
+      "department": {
+        "_id": "457diLwcQMmdpaTjo",
+        "name": "Department 1"
+      }
+    },
+    {
+      "chats": 2,
+      "user": {
+        "_id": "CaevAPDbXN252kyXa",
+        "username": "marcos.defendi",
+        "status": "online"
+      },
+      "department": {
+        "_id": "5mt9oEtQxuMMH23Co",
+        "name": "Department 2"
+      }
+    }
+  ],
+  "count": 2,
+  "offset": 0,
+  "total": 2,
+  "success": true
+}
+```
+
+## Change Log
+
+| Version | Description |
+| :--- | :--- |
+| 2.4.0 | Added |