Update Signaling documentation.

Signed-off-by: Ivan Sein <[email protected]>

docs/api-v1.md

@@ -31,6 +31,8 @@
 - [Guests](#guests)
   * [Set display name](#set-display-name)
 - [Signaling](#signaling)
+  * [Get signaling settings](#get-signaling-settings)
+  * [External signaling API](#external-signaling-api)
 
 
 Base endpoint is: `/ocs/v2.php/apps/spreed/api/v1`
@@ -577,4 +579,23 @@ Base endpoint is: `/ocs/v2.php/apps/spreed/api/v1`
 
 ## Signaling
 
-See the [Draft](https://github.com/nextcloud/spreed/wiki/Signaling-API) in the wiki…
+### Get signaling settings
+
+* Method: `GET`
+* Endpoint: `/signaling/settings`
+* Data:
+
+    field | type | Description
+    ------|------|------------
+    `stunservers` | array | STUN servers
+    `turnservers` | array | TURN servers
+    `server` | string | URL of the external signaling server
+    `ticket` | string | Ticket for the external signaling server
+
+* Response:
+    - Header:
+        + `200 OK`
+        + `404 Not Found`
+
+### External signaling API
+See External Signaling API [Draft](https://github.com/nextcloud/spreed/wiki/Signaling-API) in the wiki…