Add source to Hello-Maven

NOTES.md

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+# Apache Maven 'Hello World!'
+This is a small project for demonstrating the Apache Maven build management tool.
+
+## Getting Started
+You will need to have the following tools installed on your system:
+- Git
+- Java
+- Maven
+
+The following versions were used to create, build, and test this project:
+```
+# git --version
+git version 2.33.0
+
+# java -version
+openjdk version "14.0.2" 2020-07-14
+OpenJDK Runtime Environment (build 14.0.2+12-46)
+OpenJDK 64-Bit Server VM (build 14.0.2+12-46, mixed mode, sharing)
+
+# mvn -version
+Apache Maven 3.8.2 (ea98e05a04480131370aa0c110b8c54cf726c06f)
+Maven home: /usr/local/Cellar/maven/3.8.2/libexec
+Java version: 16.0.2, vendor: Homebrew, runtime: /usr/local/Cellar/openjdk/16.0.2/libexec/openjdk.jdk/Contents/Home
+Default locale: en_US, platform encoding: UTF-8
+OS name: "mac os x", version: "11.4", arch: "x86_64", family: "mac"
+```
+
+These versions are not a requirement but are provided to provide some visibility into the build environment needed to run this project.
+
+## Building the Project with Maven
+To build the project with Maven, clone the repo and run the following command inside the repo:
+
+```
+mvn package
+```
+
+## Testing the Project with Java
+The project includes a [very simple test](src/test/java/com/learningjenkins/AppTest.java) that demonstrates an assertion that will always pass.
+
+To test the packaged code, build the code and run the following command inside the repo:
+
+```
+java -cp target/hello-1.0-SNAPSHOT.jar com.learningjenkins.App
+```

pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+
+<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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <groupId>com.learningjenkins</groupId>
+  <artifactId>hello</artifactId>
+  <version>1.0-SNAPSHOT</version>
+
+  <name>hello</name>
+  <!-- FIXME change it to the project's website -->
+  <url>http://www.example.com</url>
+
+  <properties>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    <maven.compiler.source>1.7</maven.compiler.source>
+    <maven.compiler.target>1.7</maven.compiler.target>
+  </properties>
+
+  <dependencies>
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <version>4.11</version>
+      <scope>test</scope>
+    </dependency>
+  </dependencies>
+
+  <build>
+    <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
+      <plugins>
+        <!-- clean lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#clean_Lifecycle -->
+        <plugin>
+          <artifactId>maven-clean-plugin</artifactId>
+          <version>3.1.0</version>
+        </plugin>
+        <!-- default lifecycle, jar packaging: see https://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_jar_packaging -->
+        <plugin>
+          <artifactId>maven-resources-plugin</artifactId>
+          <version>3.0.2</version>
+        </plugin>
+        <plugin>
+          <artifactId>maven-compiler-plugin</artifactId>
+          <version>3.8.0</version>
+        </plugin>
+        <plugin>
+          <artifactId>maven-surefire-plugin</artifactId>
+          <version>2.22.1</version>
+        </plugin>
+        <plugin>
+          <artifactId>maven-jar-plugin</artifactId>
+          <version>3.0.2</version>
+        </plugin>
+        <plugin>
+          <artifactId>maven-install-plugin</artifactId>
+          <version>2.5.2</version>
+        </plugin>
+        <plugin>
+          <artifactId>maven-deploy-plugin</artifactId>
+          <version>2.8.2</version>
+        </plugin>
+        <!-- site lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#site_Lifecycle -->
+        <plugin>
+          <artifactId>maven-site-plugin</artifactId>
+          <version>3.7.1</version>
+        </plugin>
+        <plugin>
+          <artifactId>maven-project-info-reports-plugin</artifactId>
+          <version>3.0.0</version>
+        </plugin>
+      </plugins>
+    </pluginManagement>
+  </build>
+</project>

src/main/java/com/learningjenkins/App.java

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+package com.learningjenkins;
+
+/**
+ * Hello world!
+ *
+ */
+public class App 
+{
+    public static void main( String[] args )
+    {
+        System.out.println( "Hello World!" );
+    }
+}

src/test/java/com/learningjenkins/AppTest.java

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+package com.learningjenkins;
+
+import static org.junit.Assert.assertTrue;
+
+import org.junit.Test;
+
+/**
+ * Unit test for simple App.
+ */
+public class AppTest 
+{
+    /**
+     * Rigorous Test :-)
+     */
+    @Test
+    public void shouldAnswerWithTrue()
+    {
+        assertTrue( true );
+    }
+}