Add discovery method for Denon receiver (#16035)

Signed-off-by: Jacob Laursen <jacob-github@vindvejr.dk>

bundles/org.openhab.binding.denonmarantz/src/main/resources/OH-INF/addon/addon.xml

@@ -9,6 +9,15 @@
 	<connection>local</connection>
 
 	<discovery-methods>
+		<discovery-method>
+			<service-type>upnp</service-type>
+			<match-properties>
+				<match-property>
+					<name>manufacturer</name>
+					<regex>(?i)DENON</regex>
+				</match-property>
+			</match-properties>
+		</discovery-method>
 		<discovery-method>
 			<service-type>mdns</service-type>
 			<mdns-service-type>_raop._tcp.local.</mdns-service-type>
@@ -21,5 +30,4 @@
 		</discovery-method>
 	</discovery-methods>
 
-
 </addon:addon>