cleanup & add cape to player

src/main/java/cc/fascinated/player/impl/Cape.java

@@ -0,0 +1,13 @@
+package cc.fascinated.player.impl;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+
+@Getter @AllArgsConstructor
+public class Cape {
+
+    /**
+     * The URL of the cape
+     */
+    private final String url;
+}