Add README with project description and usage

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

README.md

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+# Collatz Conjecture (Python)
+
+An interactive visualizer for the **Collatz Conjecture** built with Python, tkinter, and Matplotlib — styled with the [Catppuccin Mocha](https://github.com/catppuccin/catppuccin) color palette.
+
+## What is the Collatz Conjecture?
+
+Given any positive integer **x**, apply the following rules repeatedly:
+
+- If **x** is **even** → `x = x / 2`
+- If **x** is **odd** → `x = 3x + 1`
+
+The conjecture states that no matter which starting value you choose, the sequence will always eventually reach **1**. Simple to state, yet unproven for over 80 years.
+
+## Features
+
+- Plot the Collatz sequence for any integer x ≥ 2
+- Four chart types: **Line**, **Scatter**, **Bar**, **Step**
+- Hover tooltip explaining the Collatz equation
+- View the full sequence values in a scrollable dialog
+- Clean graph to start fresh
+- Navigation toolbar for zoom, pan, and export
+- Dark theme (Catppuccin Mocha)
+
+## Requirements
+
+```
+python >= 3.10
+matplotlib
+tkinter (usually bundled with Python)
+```
+
+Install dependencies:
+
+```bash
+pip install matplotlib
+```
+
+## Usage
+
+```bash
+python collatz.py
+```
+
+Enter a starting value for **x**, choose a graph type, and click **Plot** (or press Enter).