[add]: sample java app with xml resposne

spring-boot-xml/naive-spring-boot/.gitattributes

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+/mvnw text eol=lf
+*.cmd text eol=crlf

spring-boot-xml/naive-spring-boot/.gitignore

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+HELP.md
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/

spring-boot-xml/naive-spring-boot/.mvn/wrapper/maven-wrapper.properties

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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
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+#   http://www.apache.org/licenses/LICENSE-2.0
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+wrapperVersion=3.3.2
+distributionType=only-script
+distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.9.9/apache-maven-3.9.9-bin.zip

spring-boot-xml/naive-spring-boot/README.md

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+<h1>Sample java spring boot with xml</h1>
+<p>This project is a Spring Boot application that serves a simple REST API endpoint returning XML responses.</p>
+
+<h2>How to Run</h2>
+<p>Ensure you have Java 17 installed. Then, follow these steps:</p>
+<ol>
+<li>Clone the repository </li>
+<li>Navigate into the project directory</li>
+<li>Build the project: <code>mvn clean install</code></li>
+<li>Run the application: <code>mvn spring-boot:run</code></li>
+</ol>
+
+<h2>API Endpoints</h2>
+<h3>Get User (Returns XML)</h3>
+<p>Endpoint: <code>GET /api/user</code></p>
+
+<h3>Testing with Curl</h3>
+<p>To make a request using <code>curl</code>, use the following command:</p>
+<pre>
+<code>curl -X GET -H "Accept: application/xml" http://localhost:8080/api/user</code>
+</pre>
+
+<h2>Expected XML Response</h2>
+<pre>
+<code>
+&lt;User&gt;
+&lt;name&gt;John Doe&lt;/name&gt;
+&lt;age&gt;30&lt;/age&gt;
+&lt;phone&gt;0101233333&lt;/phone&gt;
+&lt;/User&gt;
+</code>
+</pre>
+
+<h2>Dependencies</h2>
+<ul>
+<li>Spring Boot</li>
+<li>Spring Web</li>
+<li>JAXB for XML serialization</li>
+</ul>