Add README for Amazon product availability checker

Beginner_Projects/Amazon product availability checker/README.md

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+\# Amazon Product Availability Checker
+
+
+
+\## Description
+
+This Python script checks whether an Amazon product 
+
+is available for purchase by scraping the product page.
+
+It helps users track product availability without 
+
+manually visiting Amazon repeatedly.
+
+
+
+\## Tech Stack
+
+\- Python
+
+\- BeautifulSoup / Requests library
+
+
+
+\## How to Run
+
+
+
+\### 1. Install dependencies
+
+```bash
+
+pip install requests beautifulsoup4
+
+```
+
+
+
+\### 2. Run the script
+
+```bash
+
+python amazon.py
+
+```
+
+
+
+\## Input
+
+\- Amazon product URL
+
+
+
+\## Output
+
+\- Availability status of the product (In Stock / Out of Stock)
+
+
+
+\## Use Case
+
+Useful for tracking limited edition products, 
+
+sale items, or frequently out-of-stock products.
+
+
+
+\## Author
+
+Contributed by \[Niharika Gupta](https://github.com/guptaniharika8953)
+
+as part of GSSoC 2026.
+