Add README for Day 22: Tuples & Sets

Added a comprehensive introduction to Tuples and Sets, including key concepts, syntax, practice exercises, best practices, and instructions on how to run related code.

Author: woliul

day_22_Tuples_Sets/README.md

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+# Day 22: Tuples & Sets 🗂️
+
+Welcome to Week 4! We're starting with two more versatile data structures: **Tuples** and **Sets**. While lists and dictionaries are great all-purpose tools, Tuples and Sets solve specific problems more elegantly and efficiently.
+
+### Key Concepts
+
+#### Tuples
+Think of a **tuple** as an immutable list—a collection of items that, once created, **cannot be changed**. They are **ordered**, meaning elements have a defined position.
+
+* **Key Feature:** Immutability. This makes them useful for data that should be constant, like a point on a graph or the dimensions of an image. It also makes them faster to process than lists.
+* **Syntax:** Defined using parentheses `()`.
+
+#### Sets
+A **set** is a collection of items that are **unordered** and **do not allow duplicate elements**. 
+
+[Image of a Venn Diagram with Union, Intersection, and Difference]
+ This makes them ideal for tasks involving uniqueness and set logic.
+
+* **Key Feature:** Uniqueness. If you convert a list to a set, all duplicate elements are automatically removed. They also provide extremely fast membership testing (`if item in my_set`).
+* **Syntax:** Defined using curly braces `{}`.
+
+### 📝 Practice Exercises
+
+1.  **Find the Unique Vowels:** Given a string, use a set to find all the unique vowels in it.
+2.  **Combine Data:** You have two lists of students who attended two different events. Use set operations to find:
+    * Students who attended **both** events.
+    * Students who attended **only one** of the events.
+3.  **Tuple to List:** Create a tuple of your favorite movies. Convert it to a list, add a new movie, and then convert it back to a tuple.
+
+### ✨ Best Practices & Professional Notes
+
+* **Use Tuples for Fixed Data:** If you have data that shouldn't change, like a database record or configuration values, a tuple is a safer and more memory-efficient choice than a list.
+* **Use Sets for Uniqueness:** Sets are the fastest way to check for membership and eliminate duplicates. Don't use them for data that needs to be in a specific order.
+
+### 🏃 How to Run This Code
+
+1.  Open your terminal or command prompt.
+2.  Navigate to the `day_22_Tuples_&_Sets` directory.
+    ```bash
+    cd path/to/your/fluffy-python/day_22_Tuples_&_Sets
+    ```
+3.  Run the script using:
+    ```bash
+    python tuples_sets_intro.py
+    ```
+
+---
+
+### ➡️ What's Next?
+
+Tomorrow, we will explore advanced string manipulation and a powerful tool called **Regular Expressions** to find and match text patterns.
+
+[⬅️ Back to Main Repository](./README.md)