adding ReadMe.md to describe maven usage, configuring exec:java plugin to execute the main 'namespace'

examples/maven/hello-world/ReadMe.md

@@ -0,0 +1,30 @@
+# Kotlin hello-world example with maven
+
+## Prerequisites to running the example
+
+ * download Maven directly from the [Apache Maven homepage](http://maven.apache.org/download.html)
+ * install and configure your system as described in [the installation section](http://maven.apache.org/download.html#Installation)
+
+## Compiling/Testing/Running the example
+
+If you have maven on your path, simple type:
+
+	mvn test
+	
+It will compile:
+ * src/main/kotlin/Hello.kt into target/classes/hello/namespace.class
+ * src/main/kotlin/Hello.kt into target/test-classes/hello/tests/HelloTest.class
+
+Then run tests, and finnaly run your man hello 'namespace'.
+
+## Only running the example
+
+Once you compiled the sources with previous 'mvn test' command, you can run the application by typing:
+
+	mvn exec:java
+	
+## Using commandline arguments
+
+If you want to modify the main method in Hello.kt in order to use commandline arguments, you can specify them on commandline as:
+
+	mvn exec:java -Dexec.args="argument1"

examples/maven/hello-world/pom.xml

@@ -59,6 +59,22 @@
                     </execution>
                 </executions>
             </plugin>
+			<plugin>
+				<groupId>org.codehaus.mojo</groupId>
+				<artifactId>exec-maven-plugin</artifactId>
+				<version>1.2.1</version>
+				<executions>
+					<execution>
+						<phase>test</phase>
+						<goals>
+							<goal>java</goal>
+						</goals>
+					</execution>
+				</executions>
+				<configuration>
+					<mainClass>hello.namespace</mainClass>
+				</configuration>
+			</plugin>
         </plugins>
     </build>