Add a section in the documentation about running the example from the command line.

Author: cescoffier

core-examples/README.adoc

@@ -6,6 +6,18 @@ Vert.x core provides fairly low level functionality for a diverse range of funct
 WebSockets, file system access, timers, verticles and more. Please consult the Vert.x core manual for detailed
 documentation on Vert.x core.
 
+
+Examples can be run directly from the IDE by executing the `main` method. Alternatively, you can run them using the
+`vertx` command line tool (that need to be installed beforehand):
+
+```
+mvn clean compile
+vertx run fully-qualified-name-of-the-example -cp target/classes
+```
+
+Adapt the `-cp` option value for your current working directory and operating system.
+
+
 == Dependencies required
 
 To use Vert.x core in your own Maven or Gradle project add the following dependency

core-examples/pom.xml

@@ -47,25 +47,6 @@
         </plugin>
       </plugins>
     </pluginManagement>
-    <plugins>
-      <plugin>
-        <!-- copy dependencies to ease the usage of the vertx command line -->
-        <artifactId>maven-dependency-plugin</artifactId>
-        <version>2.10</version>
-        <executions>
-          <execution>
-            <id>copy-dependencies</id>
-            <goals>
-              <goal>copy-dependencies</goal>
-            </goals>
-            <phase>verify</phase>
-            <configuration>
-              <outputDirectory>${project.build.directory}/dependencies</outputDirectory>
-            </configuration>
-          </execution>
-        </executions>
-      </plugin>
-    </plugins>
   </build>