Add ONVIF media bicep (#121)

## Purpose
Add bicep file for ONVIF media connector

Author: dominicbetts

samples/onvif-connector-bicep/asset-onvif-media.bicep

@@ -0,0 +1,21 @@
+metadata description = 'ONVIF camera media capabilities'
+param aepName  string
+param customLocationName string
+param assetName     string = 'camera-media'
+param displayName string = 'Camera media service'
+
+/*****************************************************************************/
+/*                                    Asset                                  */
+/*****************************************************************************/
+resource asset 'Microsoft.DeviceRegistry/assets@2024-11-01' = {
+  name: assetName
+  location: resourceGroup().location
+  extendedLocation: {
+    type: 'CustomLocation'
+    name: customLocationName
+  }
+  properties: {
+    displayName: displayName
+    assetEndpointProfileRef: aepName
+  }
+}