feat: update java-concurrency

Author: wx-chevalier

java/concurrency/README.md

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+# Java Concurrency Snippets
+
+参考 []() 获取完整的并发编程与代码说明。

java/concurrency/async/future/.classpath

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-package basics.concurrencyLibrary;
+package concurrency.collection;
 
 import java.util.concurrent.ArrayBlockingQueue;
 import java.util.concurrent.BlockingQueue;

java/concurrency/async/future/.settings/org.eclipse.core.resources.prefs

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+package concurrency.collection.concurrent_bag;
+
+/**
+ * @see https://github.com/brettwooldridge/HikariCP/blob/dev/src/main/java/com/zaxxer/hikari/util/ConcurrentBag.java
+ */
+public class ConcurrentBag {
+}