Scaffold minimal C# console app with first-agent greeting output

[Copilot]

The request was to add a simple C# “hello world” program that returns output for a first agent-generated program. This PR introduces a minimal .NET console app and sets the output text accordingly.

• Application scaffolding

  • Added a minimal C# console project at repository root (ZTEST.csproj) so the repo is runnable as a .NET app.

• Program output

  • Updated Program.cs to emit the requested first-agent greeting message.

• Repository hygiene

  • Added .gitignore entries for bin/ and obj/ to prevent build artifacts from being tracked.

Console.WriteLine("Hello World! This is my first agent auto program.");