added javadoc target

tools/cooja/apps/mspsim/build.xml

@@ -30,6 +30,18 @@
     </javac>
   </target>
 
+  <target name="javadoc" depends="init">
+    <delete dir="${javadoc}" quiet="true"/>
+    <mkdir dir="${javadoc}/"/>
+    <javadoc destdir="${javadoc}">
+      <fileset dir="${src}/" includes="**/*.java"/>
+      <classpath>
+        <pathelement location="lib/mspsim.jar"/>
+        <pathelement location="${cooja_jar}"/>
+      </classpath>
+    </javadoc>
+  </target>
+
   <target name="jar" depends="clean, init, compile">
     <jar destfile="${cooja_mspsim_jar}" basedir="${build}">
       <fileset dir="${build}"/>