Create README.md

Author: SA01

README.md

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+# Spark Window Functions
+
+This repository contains the code and examples for my article on Medium, which provides an introduction to Window Functions in Apache Spark. You can read the full article here:  
+[**An Introduction to Window Functions in Apache Spark with Examples**](https://medium.com/@suffyan.asad1/an-introduction-to-window-functions-in-apache-spark-with-examples-66cb06b06e1f)
+
+### Summary of the Article:
+
+In this guide, I explain how to use **Window Functions** in Apache Spark to perform advanced data transformations. Key topics covered include:
+
+- **What are Window Functions?**: Learn the basics of Window Functions and how they differ from standard SQL functions.
+- **Defining Window**: Types of Window including static and sliding windows.
+- **Operations on Window Functions**: Explore the different types of Window Functions such as ranking, aggregate, and analytical functions.
+- **Implementing Window Functions in Spark**: Step-by-step examples of how to implement and use Window Functions in PySpark.
+
+The code in this repository allows you to follow along with the examples in the article and provides hands-on demonstration of using Window Functions for data transformations in Apache Spark.