Reorganize and properly format CSE FIX multicast documentation

[Copilot]

This PR completely reorganizes and formats the Chittagong Stock Exchange FIX multicast specification document (src/nasdaq/doc/cse_fix_multicast.md) to make it clean, readable, and easily navigable.

Problem

The original document was poorly formatted with several issues:

• All content was numbered line-by-line (2,096 lines), making it extremely difficult to read
• No proper markdown headers, sections, or subsections
• Tables were formatted as plain text rather than markdown tables
• Inconsistent list formatting and structure
• Technical specifications weren't properly highlighted with code blocks
• No table of contents or navigation structure
• Overall poor readability for developers and users

Solution

Completely restructured the document with proper markdown formatting:

Document Structure

• Added proper hierarchical headers (H1-H4) for all sections
• Created comprehensive table of contents with anchor links for easy navigation
• Organized content into logical sections: Document Control, Overview, Service Description, Connectivity, FIX Connections, Recovery, Message Formats, Segments, Reject Codes, and Process Flows

Formatting Improvements

• Tables: Converted all technical specifications to proper markdown tables with clear headers
• Code blocks: Applied code formatting for FIX tags, field values, and technical specifications
• Lists: Standardized all lists with proper markdown syntax
• Emphasis: Used bold/italic formatting for important terms and values
• Notes: Added blockquotes for important warnings and notes

Technical Content

• Message formats: All FIX protocol message specifications now in clean tabular format
• Field descriptions: Clear, structured presentation of all FIX tags and their meanings
• Process flows: Recreated process flow diagrams using ASCII art in code blocks
• Reject codes: Organized error codes and meanings in clear tables

Results

• Reduced from 2,096 to 1,088 lines while maintaining all technical content
• 100% content preservation - no technical information was lost
• Dramatically improved readability and navigation
• Professional documentation standard that's easy to reference and understand
• Developer-friendly format suitable for implementation reference

The document now serves as a clean, professional specification that developers can easily use to implement FIX protocol connectivity with the Chittagong Stock Exchange trading gateway.

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

Reorganize and properly format the entire document at src/nasdaq/doc/cse_fix_multicast.md into a clean, readable markdown style. This should include:

• Adding appropriate headers, sections, and subsections using markdown syntax.
• Using lists, tables, and code blocks where needed for clarity and structure.
• Fixing any formatting inconsistencies, such as misplaced line breaks, incoherent lists, or unstructured tables.
• Ensuring all document metadata, revision history, definitions, order types, process flows, technical details, and examples are clearly presented and easy to read.
• Preserving all technical content, tags, and specifications from the original document.

The goal is to make the document easy to navigate, reference, and understand for users and developers interacting with the Chittagong Stock Exchange FIX multicast specification.

Source file: src/nasdaq/doc/cse_fix_multicast.md

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