Add documentation for the IGB Manager

IGB can display formatted text in the right panel of the IGB App Manager. Explain how to use your App by creating a README.md (markdown) file - this should reside at the top-level of your App project.

Create README.md file to include with your App

To add documentation to your App:

• Create a file named README.md
• Save it in the top level of your IGB App project (same level as pom.xml)
• Edit your pom.xml file as follows

Add Bundle-Description tag to pom.xml

Add a Bundle-Description tag within the instructions tag of the org.apache.felix maven-bundle-plugin section of your pom.xml:

<Bundle-Description>${bundleDescription}</Bundle-Description> 

Add bundle-markdown-encoder plugin (from IGB project)

Also add the following plugin (as a child of the plugins tag):

<plugin>
    <groupId>com.lorainelab</groupId>
    <artifactId>bundle-markdown-encoder</artifactId>
    <executions>
       <execution>
          <goals>
            <goal>encodeMarkdown</goal>
          </goals>
       </execution> 
    </executions>
</plugin>