Added Player#isReady

Author: devgianlu

player/src/main/java/xyz/gianlu/librespot/player/Player.java

@@ -280,7 +280,7 @@ public void removeFromQueue(@NotNull String uri) {
     @NotNull
     public Future<Player> ready() {
         CompletableFuture<Player> future = new CompletableFuture<>();
-        if (state.isReady()) {
+        if (isReady()) {
             future.complete(this);
             return future;
         }
@@ -756,6 +756,13 @@ public boolean isActive() {
         return state != null && state.isActive();
     }
 
+    /**
+     * @return Whether the player is ready
+     */
+    public boolean isReady() {
+        return state != null && state.isReady();
+    }
+
     /**
      * @return A {@link Tracks} instance with the current player queue
      */