Add queue README (non-technical overview)

Add app/api/queue/README.md providing a plain-language overview of the queue: what it is, why it's needed, how tasks are added and processed, benefits (fairness, efficiency, reliability), and a real-life example. Intended for non-technical readers and contributors to explain queue behavior without code details.

Author: goldlabelapps

app/api/queue/README.md

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+# Queue Overview
+
+## What is the Queue?
+
+The queue is like a waiting line for tasks that need to be done. Imagine you are at a store, and people are waiting in line to be helped. The queue in our system works the same way, but instead of people, it manages jobs or tasks that the computer needs to process.
+
+## Why Do We Need a Queue?
+
+Sometimes, there are too many tasks for the computer to handle all at once. The queue helps by organizing these tasks in the order they arrive, so each one gets done, one after the other. This makes sure nothing is forgotten and everything is handled fairly.
+
+## How Does the Queue Work?
+
+- **Adding Tasks:** When there is something new to do, it gets added to the end of the queue.
+- **Processing Tasks:** The computer takes the first task in the queue and works on it. When it’s done, it moves to the next one.
+- **Staying Organized:** The queue keeps everything in order, so tasks are not missed or done out of turn.
+
+## Why Is This Important?
+
+- **Fairness:** Every task gets its turn, just like people in a line.
+- **Efficiency:** The computer doesn’t get overwhelmed by trying to do everything at once.
+- **Reliability:** Tasks are not lost or forgotten, so the system works smoothly.
+
+## Real-Life Example
+
+Think of the queue as a to-do list. When you write down things you need to do, you do them one by one. The queue helps the computer do the same thing, making sure every job is completed in the right order.
+
+---
+
+This overview is for anyone who wants to understand what the queue does, without needing to know how to code or how computers work inside. If you have questions, just ask!