docs: add table of contents to README

Author: Dev9269

README.md

@@ -4,6 +4,16 @@ Live demo: **[malware-detector-production.up.railway.app](https://malware-detect
 
 AI-powered PE malware detection — upload a file and get instant classification.
 
+## Table of Contents
+
+- [Features](#features)
+- [Quick Start](#quick-start)
+- [API](#api)
+- [Running Tests](#running-tests)
+- [Architecture](#architecture)
+- [Contributing](#contributing)
+- [License](#license)
+
 ## Features
 
 - **PE Analysis** — parses PE headers, sections, imports, DLLs, hashes