Implemented the API call for song lyrics

app/src/main/java/com/cappielloantonio/play/subsonic/models/Lyrics.java

@@ -1,66 +1,37 @@
 package com.cappielloantonio.play.subsonic.models;
 
+import com.tickaroo.tikxml.annotation.Attribute;
+import com.tickaroo.tikxml.annotation.Xml;
+
+@Xml
 public class Lyrics {
+    @Attribute(name = "value")
     protected String content;
+    @Attribute
     protected String artist;
+    @Attribute
     protected String title;
 
-    /**
-     * Gets the value of the content property.
-     *
-     * @return possible object is
-     * {@link String }
-     */
     public String getContent() {
         return content;
     }
 
-    /**
-     * Sets the value of the content property.
-     *
-     * @param value allowed object is
-     *              {@link String }
-     */
     public void setContent(String value) {
         this.content = value;
     }
 
-    /**
-     * Gets the value of the artist property.
-     *
-     * @return possible object is
-     * {@link String }
-     */
     public String getArtist() {
         return artist;
     }
 
-    /**
-     * Sets the value of the artist property.
-     *
-     * @param value allowed object is
-     *              {@link String }
-     */
     public void setArtist(String value) {
         this.artist = value;
     }
 
-    /**
-     * Gets the value of the title property.
-     *
-     * @return possible object is
-     * {@link String }
-     */
     public String getTitle() {
         return title;
     }
 
-    /**
-     * Sets the value of the title property.
-     *
-     * @param value allowed object is
-     *              {@link String }
-     */
     public void setTitle(String value) {
         this.title = value;
     }