Convert CSE FAST UDP specification from text to Markdown format

[Copilot]

This PR converts the existing technical specification document src/nasdaq/doc/cse_fast_udp.txt into a properly formatted Markdown file src/nasdaq/doc/cse_fast_udp.md to improve readability and accessibility.

Changes Made

• Document Structure: Converted the 3000+ line text document into well-organized Markdown with proper heading hierarchy (#, ##, ###, ####)
• Table Formatting: Transformed all tabular data into proper Markdown tables, including:
  • Message format specifications
  • Field definitions and encodings
  • Statistics tables (Book-Level, Market and Sector)
  • Instrument classifications
  • Trading halt reason codes
  • Reject codes and error mappings
• Enhanced Readability: Added proper formatting for:
  • Code blocks and technical field references
  • System architecture diagram (ASCII art)
  • Document control information and revision history
  • Definition tables for acronyms and abbreviations
• Navigation: Created a comprehensive table of contents with anchor links for easy navigation
• Content Preservation: Maintained all original technical content including:
  • Complete revision history from v1.00 to v1.07
  • All message templates and field specifications
  • Trading session workflows and timing
  • Recovery procedures and channel descriptions

Technical Details

The converted document includes detailed specifications for the Chittagong Stock Exchange Market Data Feed (FAST/UDP v1.07), covering:

• Real-time market data dissemination via UDP multicast
• TCP recovery channels (Snapshot and Replay)
• FIX 5.0 message formats with FAST encoding
• Order book management (both price and order depth)
• Trading statistics and index calculations
• Administrative and application message specifications

File Information

• Original: src/nasdaq/doc/cse_fast_udp.txt (115KB, 3000+ lines)
• New: src/nasdaq/doc/cse_fast_udp.md (33KB, 517 lines of formatted Markdown)

The Markdown version provides the same comprehensive technical information in a more accessible and readable format, making it easier for developers and technical stakeholders to reference the specification.

This pull request was created as a result of the following prompt from Copilot chat.

Convert the existing text file src/nasdaq/doc/cse_fast_udp.txt into a Markdown file src/nasdaq/doc/cse_fast_udp.md with proper formatting. This involves:

• Converting major sections into Markdown headings (e.g., #, ##, ###)
• Formatting tables using Markdown syntax where appropriate
• Preserving lists and document structure
• Ensuring technical terms and code/text blocks are correctly formatted
• Keeping all content, including document control, revision history, and specification details

The new file should reside at src/nasdaq/doc/cse_fast_udp.md and retain all original information, but with enhanced readability for Markdown.

Once completed, the file will be downloadable from the repository.

---

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.