Added a sendMultimediaMessage function

Author: whiteboxsolutions

android/app/src/main/java/com/httpsms/SmsManagerService.kt

@@ -76,4 +76,20 @@ class SmsManagerService {
             context.getSystemService(SmsManager::class.java).createForSubscriptionId(subscriptionId)
         }
     }
+
+    fun sendMultimediaMessage(
+        context: Context, 
+        pduUri: android.net.Uri, 
+        sim: String, 
+        sentIntent: PendingIntent
+    ) {
+        val smsManager = getSmsManager(context, sim)
+        smsManager.sendMultimediaMessage(
+            context, 
+            pduUri, 
+            null,
+            null,
+            sentIntent
+        )
+    }
 }