Add comprehensive technical interview preparation guide

[Copilot]

This PR adds a comprehensive interview.md file to serve as a detailed technical interview preparation guide focusing on C++, Python, and software architecture. The guide is designed to help developers prepare for senior-level technical interviews and architect positions.

What's Included

The 2,500+ line guide covers seven major sections:

1. C++ Core Concepts

Detailed explanations and code examples for:

• Memory management (RAII, smart pointers, custom allocators)
• Move semantics with rvalue references and perfect forwarding
• Template meta-programming including SFINAE and C++20 concepts
• STL containers, algorithms, and iterator categories
• Multi-threading, synchronization primitives, and lock-free programming

2. Python Advanced Features

Comprehensive coverage of:

• GIL understanding and concurrency models
• Advanced decorators with parameters and context managers
• Asyncio, coroutines, and async frameworks
• Metaclasses and the class creation process
• Memory management, garbage collection, and optimization techniques

3. System Design & Architecture

Production-ready implementations for:

• Load balancers with multiple algorithms (round-robin, weighted, least connections)
• Distributed caching with consistent hashing
• Rate limiters (token bucket, sliding window)
• Message queues with priority and retry mechanisms
• Circuit breaker patterns for fault tolerance

4. Design Patterns

Complete examples in both C++ and Python for:

• Creational: Factory, Builder, Singleton patterns
• Structural: Adapter, Composite patterns with real-world use cases
• Behavioral: Observer, Strategy, Command patterns with thread-safe implementations

5. Common Interview Questions & Solutions

Detailed implementations for frequently asked questions:

• C++: Thread-safe queue, memory pool, custom smart pointer, move semantics
• Python: Context managers, parameterized decorators, async frameworks, metaclasses
• System Design: Rate limiters, distributed cache, service discovery, message queues

6. Best Practices & Security

Production-ready guidance on:

• Code quality standards and patterns
• Comprehensive testing strategies with examples
• Performance optimization techniques
• Security considerations including input validation, encryption, and secure coding practices

7. Interview Process Tips

Strategic advice for:

• Technical discussion approaches and communication
• Code review best practices with example feedback
• System design methodology with step-by-step process
• Problem-solving frameworks including the STAR method and debugging approaches

Code Quality

All code examples are:

• Production-ready with proper error handling
• Thread-safe where applicable
• Well-documented with clear explanations
• Tested with example usage patterns
• Following industry best practices and coding standards

This guide serves as both a comprehensive study resource and a reference document for technical interviews at senior software engineer and architect levels.

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