Add android smack source.

Change-Id: I49ce97136c17173c4ae3965c694af6e7bc49897d
diff --git a/src/org/jivesoftware/smackx/receipts/ReceiptReceivedListener.java b/src/org/jivesoftware/smackx/receipts/ReceiptReceivedListener.java
new file mode 100644
index 0000000..3183113
--- /dev/null
+++ b/src/org/jivesoftware/smackx/receipts/ReceiptReceivedListener.java
@@ -0,0 +1,26 @@
+/**

+ * Copyright 2013 Georg Lukas

+ *

+ * All rights reserved. Licensed under the Apache License, Version 2.0 (the "License");

+ * you may not use this file except in compliance with the License.

+ * You may obtain a copy of the License at

+ *

+ *     http://www.apache.org/licenses/LICENSE-2.0

+ *

+ * Unless required by applicable law or agreed to in writing, software

+ * distributed under the License is distributed on an "AS IS" BASIS,

+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

+ * See the License for the specific language governing permissions and

+ * limitations under the License.

+ */

+

+package org.jivesoftware.smackx.receipts;

+

+/**

+ * Interface for received receipt notifications.

+ * 

+ * Implement this and add a listener to get notified. 

+ */

+public interface ReceiptReceivedListener {

+    void onReceiptReceived(String fromJid, String toJid, String receiptId);

+}
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