[EXAMPLES] Add an example for parsing messages
diff --git a/examples/src/main/java/org/apache/james/mime4j/samples/dom/ParsingMessage.java b/examples/src/main/java/org/apache/james/mime4j/samples/dom/ParsingMessage.java
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+/****************************************************************
+ * Licensed to the Apache Software Foundation (ASF) under one   *
+ * or more contributor license agreements.  See the NOTICE file *
+ * distributed with this work for additional information        *
+ * regarding copyright ownership.  The ASF licenses this file   *
+ * to you 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.apache.james.mime4j.samples.dom;
+
+import java.io.ByteArrayInputStream;
+import java.nio.charset.StandardCharsets;
+
+import org.apache.commons.io.IOUtils;
+import org.apache.james.mime4j.dom.Message;
+import org.apache.james.mime4j.dom.TextBody;
+import org.apache.james.mime4j.message.DefaultMessageBuilder;
+import org.apache.james.mime4j.stream.MimeConfig;
+
+public class ParsingMessage {
+    private static String MESSAGE = "MIME-Version: 1.0\r\n" +
+        "From: John Doe <jdoe@machine.example>\r\n" +
+        "To: Mary Smith <mary@example.net>\r\n" +
+        "Subject: Saying Hello\r\n" +
+        "Date: Thu, 24 Jun 2021 14:04:28 +0700\r\n" +
+        "Message-ID:\r\n" +
+        " <Mime4j.0.8520adcfe13bd088.17a3cd59575@interview1-HP-ProBook-440-G6>\r\n" +
+        "Content-Type: text/plain; charset=ISO-8859-1\r\n" +
+        "\r\n" +
+        "This is a message just to say hello.\r\n" +
+        "So, \"Hello\".\r\n";
+
+    public static void main(String[] args) throws Exception {
+        DefaultMessageBuilder defaultMessageBuilder = new DefaultMessageBuilder();
+        defaultMessageBuilder.setMimeEntityConfig(MimeConfig.PERMISSIVE);
+
+        Message message = defaultMessageBuilder.parseMessage(new ByteArrayInputStream(MESSAGE.getBytes(StandardCharsets.UTF_8)));
+
+        System.out.println("The subject is " + message.getSubject());
+
+        TextBody textBody = (TextBody) message.getBody();
+        System.out.println("------------------------------");
+        System.out.println("Content: " + IOUtils.toString(textBody.getInputStream(), textBody.getMimeCharset()));
+        System.out.println("------------------------------");
+    }
+}