Add notebook for item 39: Use Queue to Coordinate Work Between Threads

[jekwatt]

Notebook for item 39:

• item_39_use_queue

[jekwatt]

See the below for related subjects:

• item 37 Add notebook for item 37: Use Threads for Blocking I/O, Avoid for Parallelism #96
• item 38 Add notebook for item 38: Use Lock to Prevent Data Races in Threads #73
• item 46 Add notebook for item 46: Use Built-in Algorithms and Data Structures #68