[xmppclient] Improved readme file (openhab#5722)

* Improved readme

Signed-off-by: Pavel Gololobov <pavel@ochat.org>
Signed-off-by: Maximilian Hess <mail@ne0h.de>

bundles/org.openhab.binding.xmppclient/README.md

@@ -8,24 +8,40 @@ xmppBridge - Basic XMPP (Jabber) client thing, that can send and receive message
 
 ## Thing Configuration
 
-**xmppBridge** parameters:
+Sample configurations:
+
+```
+Bridge xmppclient:xmppBridge:xmpp "XMPP Client" [ username="openhab", domain="example.com", password="********" ] {
+ Channels:
+ Trigger String : xmpp_command [ separator="##" ]
+}
+```
 
-| Name | Label | Description | Required |
-|----------|-------------|------|------|
-| host | Server Hostname/IP | The IP/Hostname of the XMPP server | true |
-| port | XMPP server Port | The typical port is 5222 | true |
-| username | Username | The XMPP username | true |
-| password | Password | The XMPP password | true |
+```
+Bridge xmppclient:xmppBridge:xmpp "XMPP Client" [ host="xmpp.example.com", port=7222, username="openhab", domain="example.com", password="********" ] {
+ Channels:
+ Trigger String : xmpp_command [ separator="##" ]
+}
+```
+
+**xmppBridge** parameters:
 
+| Name | Label | Description | Required | Default value |
+|----------|--------------------|-------------------------------------------|-----------|-----------------------|
+| username | Username | The XMPP username (left part of JID) | true | - |
+| domain | Domain | The XMPP domain name (right part of JID) | true | - |
+| password | Password | The XMPP user password | true | - |
+| host | Server Hostname/IP | The IP/Hostname of the XMPP server | false | as "domain" parameter |
+| port | XMPP server Port | The typical port is 5222 | false | 5222 |
 
 ## Channels
 
 **publishTrigger** parameters:
 
-| Name | Label | Description | Required |
-|----------|-------------|------|------|
-| payload | Payload condition | An optional condition on the value | false |
-| separator | Separator character | The trigger channel payload usually only contains the received text. If you define a separator character, for example '#', the sender UID and received text will be in the trigger channel payload. For example: pavel@example.com#My Message Text | false |
+| Name  | Label  | Description  | Required |
+|-----------|---------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------|
+| payload  | Payload condition  | An optional condition on the value  | false  |
+| separator | Separator character | The trigger channel payload usually only contains the received text. If you define a separator character, for example '#', the sender UID and received text will be in the trigger channel payload. For example: pavel@example.com#My Message Text | false  |
 
 ## Example Rules