Add hello world sample

Issue #1158

Author: fmbenhassine

spring-shell-samples/pom.xml

@@ -14,6 +14,7 @@
 	<description>Samples applications of how to use Spring Shell</description>
 
 	<modules>
+		<module>spring-shell-sample-hello-world</module>
 		<module>spring-shell-sample-catalog</module>
 		<module>spring-shell-sample-commands</module>
 		<module>spring-shell-sample-e2e</module>

spring-shell-samples/spring-shell-sample-hello-world/pom.xml

@@ -0,0 +1,35 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+		 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+
+	<parent>
+		<groupId>org.springframework.shell</groupId>
+		<artifactId>spring-shell-samples</artifactId>
+		<version>4.0.0-SNAPSHOT</version>
+	</parent>
+
+	<artifactId>spring-shell-sample-hello-world</artifactId>
+	<name>Spring Shell Samples - Hello World</name>
+	<packaging>jar</packaging>
+	<description>Hello World Spring Shell application</description>
+
+	<dependencies>
+		<dependency>
+			<groupId>org.springframework.shell</groupId>
+			<artifactId>spring-shell-starter</artifactId>
+			<version>${project.parent.version}</version>
+		</dependency>
+
+		<dependency>
+			<groupId>org.hibernate.validator</groupId>
+			<artifactId>hibernate-validator</artifactId>
+			<version>${hibernate-validator.version}</version>
+		</dependency>
+		<dependency>
+			<groupId>org.glassfish</groupId>
+			<artifactId>jakarta.el</artifactId>
+			<version>${jakarta.el.version}</version>
+		</dependency>
+	</dependencies>
+
+</project>

spring-shell-samples/spring-shell-sample-hello-world/src/main/java/org/springframework/shell/samples/helloworld/SpringShellApplication.java

@@ -0,0 +1,23 @@
+package org.springframework.shell.samples.helloworld;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.shell.core.command.annotation.Command;
+import org.springframework.shell.core.command.annotation.EnableCommand;
+import org.springframework.shell.core.command.annotation.Option;
+
+@SpringBootApplication
+@EnableCommand(SpringShellApplication.class)
+@Command
+public class SpringShellApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(SpringShellApplication.class, args);
+	}
+
+	@Command
+	public String hello(@Option(defaultValue = "World") String name) {
+		return "Hello " + name + "!";
+	}
+
+}

spring-shell-samples/spring-shell-sample-hello-world/src/main/resources/application.properties

@@ -0,0 +1 @@
+spring.shell.interactive.enabled=true