added frequency to the return info of the port

APED/app/src/main/java/com/example/aped/utils/XMLHandler.java

@@ -86,6 +86,7 @@ public class XMLHandler implements IXML {
             Element result = (Element) xPathExpression.evaluate(
                     root, XPathConstants.NODE);
             returnDictionary.put("protocol", result.getAttribute("protocol"));
+            returnDictionary.put("frequency", result.getAttribute("frequency"));
             NodeList childNodes = result.getChildNodes();
             List<String> pins = new ArrayList<>();
             for (int i = 0; i < childNodes.getLength(); i++) {