Adding Conversation Snippet first draft

snippets/conversation/send/Snippet.java

@@ -0,0 +1,56 @@
+package conversation;
+
+import com.sinch.sdk.domains.conversation.api.v1.*;
+import com.sinch.sdk.domains.conversation.models.v1.*;
+import com.sinch.sdk.domains.conversation.models.v1.messages.request.*;
+import com.sinch.sdk.domains.conversation.models.v1.messages.response.SendMessageResponse;
+import com.sinch.sdk.domains.conversation.models.v1.messages.*;
+import com.sinch.sdk.domains.conversation.models.v1.messages.types.text.*;
+import java.util.Collections;
+import java.util.logging.Logger;
+import java.util.*;
+
+public class Snippet {
+
+  private static final Logger LOGGER = Logger.getLogger(Snippet.class.getName());
+
+  static void execute(ConversationService conversationService) {
+
+    MessagesService messagesService = conversationService.messages();
+
+    String appId = "YOUR_app_id";
+    String from = "YOUR_sms_sender";
+    String to = "RECIPIENT_number";
+    ChannelRecipientIdentity recipient = 
+        ChannelRecipientIdentity.builder()
+            .setChannel(ConversationChannel.SMS)
+            .setIdentity(to)
+            .build();
+    Collection<ChannelRecipientIdentity> recipients = new HashSet<ChannelRecipientIdentity>();
+    recipients.add(recipient);
+    String body = "This is a test Conversation message using the Sinch Java SDK.";
+    String smsSender = "SMS_SENDER";
+
+    LOGGER.info("Sending SMS Text using Conversation API");
+    SendMessageResponse value =
+        messagesService.sendMessage(
+            SendMessageRequest.builder()
+                .setAppId(appId)
+                .setRecipient(
+                    ChannelRecipientIdentities.builder()
+                        .setRecipientIdentities(recipients)
+                        .build())
+                .setMessage(
+                    AppMessage.builder()
+                        .setBody(
+                            TextMessage.builder()
+                                .setText(body)
+                                .build())
+                        .build())
+                .setChannelProperties(
+                    Collections.singletonMap(smsSender, from))
+                .build());
+
+    LOGGER.info("Response: " + value);
+  }
+}