Created comprehensive project documentation covering system architecture, component interactions, and modern C++ implementation patterns used throughout the codebase.

Documentation Additions

• Architecture Overview: Text-based diagram showing 8-layer component hierarchy from Xchange singleton down to Trade records
• Component Details: In-depth documentation of Xchange, OrderBook, PreProcessor, Level, Order, Participant, SymbolInfo, and Trade with responsibilities and interactions
• Order Flow Lifecycle: Complete 7-step flow from participant submission through PreProcessor validation to OrderBook matching and Trade execution
• C++ Feature Showcase:
  • Smart pointer patterns (shared_ptr for OrderBook shared across PreProcessors, unique_ptr for singleton)
  • STL container choices with rationale (std::map for sorted price levels, unordered_map for O(1) lookups)
  • Design patterns (Singleton, RAII, operator overloading, const correctness)
  • Type aliases and enumerations for domain clarity

Example Architecture

Xchange (Singleton)
  ├── Participants (portfolio tracking)
  └── SymbolInfo (per symbol)
       ├── OrderBook
       │    ├── Bid Levels (std::map<Price, Level, std::greater>)
       │    └── Ask Levels (std::map<Price, Level, std::less>)
       └── PreProcessors (Buy/Sell)
            └── Type-ranked order queues

Build Configuration

Updated .gitignore to exclude build artifacts (obj/, bin/, *.o)

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