added janusagent documentation

docs/agents.rst

@@ -20,3 +20,4 @@ Following *Agents* are implemented within CGRateS:
    fsagent
    kamagent
    ers
+   janusagent

docs/janusagent.rst

@@ -0,0 +1,39 @@
+.. _JanusAgent:
+
+JanusAgent
+=============
+
+
+**JanusAgent** is an api endpoint that connects to JanusServer through **CGRateS**. 
+It authorizes webrtc events in **CGRateS** for each user and after managing and creating sessions in JanusServer.
+
+The **JanusAgent** is configured within *janus_agent* section from :ref:`JSON configuration <configuration>`.
+It will listen on http port 2080 in /janus endpoint as specified in config ,it will accept same http requests that would  be sent normally to JanusServer.
+
+Sample config
+
+::
+
+ "janus_agent": {
+	"enabled": false,                         // enables the Janus agent: <true|false>
+	"url": "/janus",
+	"sessions_conns": ["*internal"],
+	"janus_conns": [{                         // instantiate connections to multiple Janus Servers
+		"address": "127.0.0.1:8088",          // janus API address 
+		"type": "*ws",                        // type of the transport to interact via janus API
+		"admin_address": "localhost:7188",    // janus admin address used to retrive more information for sessions and handles
+		"admin_password": "",                 // secret to pass restriction to communicate to the endpoint
+	}],
+	"request_processors": [],                 // request processors to be applied to Janus messages
+},
+
+Config params
+^^^^^^^^^^^^^
+
+Most of the parameters are explained in :ref:`JSON configuration <configuration>`, hence we mention here only the ones where additional info is necessary or there will be particular implementation for *JanusAgent*.
+
+Software Installation
+---------------------
+
+ For detailed information on installing JanusServer on Debian, please refer to its official `repository  <https://github.com/meetecho/janus-gateway?tab=readme-ov-file#dependencies/>`_.
+