add some definitions to readme

boilerplates-concurrency/threads_with_queues.py

@@ -0,0 +1,19 @@
+from queue import Queue
+from threading import Thread
+
+
+NUM_WORKERS = 4
+task_queue = Queue()
+
+
+def worker():
+    while True:
+        address = task_queue.get()
+        run_function(address)
+        task_queue.task_done()
+
+
+threads = [Thread(target=worker) for _ in range(NUM_WORKERS)]
+[task_queue.put(item) for item in threads]
+[thread.start() for thread in threads]
+task_queue.join()