Port Python README to .NET with C# code examples and .NET-specific adaptations

[Copilot]

This PR creates a comprehensive .NET adaptation of the Python README for the foundry-agent-service-remote-mcp repository. The new README-dotnet.md file can be used as the foundation for the .NET repository mentioned in the issue.

Key Changes Made

Language-Specific Adaptations

• Title and Description: Changed from "Python" to ".NET" throughout
• Prerequisites: Updated from Python 3.11+ to .NET SDK 8.0+, added C# VS Code extension
• Configuration: Converted from .env files to appsettings.json with proper JSON structure
• Package Management: Changed from pip install to dotnet restore commands
• Cross-platform Support: Added both Windows (copy) and Linux/macOS (cp) commands

Code Examples

• C# Azure Functions: Created accurate C# code examples using MCPToolTrigger attributes
• Program.cs: Added proper Azure Functions host setup
• FunctionApp.cs: Converted Python MCP functions to equivalent C# implementations with proper blob bindings
• Namespace: Used appropriate MCPServer namespace structure

Repository References

• Links: Updated cross-references to point to appropriate .NET and TypeScript repositories
• GitHub Codespaces: Updated badge to point to the .NET repository
• Documentation Links: Updated Azure Functions documentation to use C# pivot

File Structure

• Paths: Updated from src/mcp_server to src/MCPServer following .NET conventions
• Agent Path: Updated to src/agent for consistency
• Extensions: References changed from .py to .cs files

The resulting README maintains the same structure and flow as the original while being fully adapted for .NET developers. It includes accurate C# code examples that demonstrate the MCP server implementation using Azure Functions with the experimental MCP extension bundle.

Fixes #5.

Warning

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

• https://api.github.com/repos/Azure-Samples/foundry-agent-service-remote-mcp-dotnet/contents/
  • Triggering command: curl -s REDACTED (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to my firewall allow list

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