Add ASP.NET Core example and update README

[claudiogodoy99]

Hi team,

This PR adds a concrete example showing how to properly register and use the OpenAIClient with dependency injection in an ASP.NET Core application. It also includes a short highlighted section in the main README.md under the heading "How to use dependency injection".

PR for issue #498

[jsquire]

Thanks for your contribution, @claudiogodoy99, and your interest in improving the OpenAI developer experience. We'll take a look and see if we can get this merged in!

[jsquire]

@scottaddie, @achandmsft: Would appreciate your thoughts on sample content and docs organization.

[claudiogodoy99]

hey @jsquire, thanks for reviewing, I've made some commits addressing the comments.

[jsquire]

Thanks, @claudiogodoy99! A couple of minor nits, and I think we're good to merge.

[jsquire]

Thansk, @claudiogodoy99! I'll get this merged in.

[jsquire]

Hrmm... seeing a compile error in the pipeline. Unsure if we're missing some usings or the CI environment is misbehaving.

Error: /home/runner/work/openai-dotnet/openai-dotnet/examples/aspnet-core/Program.cs(47,18): error CS0246: The type or namespace name 'Task<>' could not be found (are you missing a using directive or an assembly reference?) [/home/runner/work/openai-dotnet/openai-dotnet/examples/OpenAI.Examples.csproj]
Error: /home/runner/work/openai-dotnet/openai-dotnet/examples/aspnet-core/Program.cs(38,22): error CS0246: The type or namespace name 'ILogger<>' could not be found (are you missing a using directive or an assembly reference?) [/home/runner/work/openai-dotnet/openai-dotnet/examples/OpenAI.Examples.csproj]
Error: /home/runner/work/openai-dotnet/openai-dotnet/examples/aspnet-core/Program.cs(41,47): error CS0246: The type or namespace name 'ILogger<>' could not be found (are you missing a using directive or an assembly reference?) [/home/runner/work/openai-dotnet/openai-dotnet/examples/OpenAI.Examples.csproj]

I'll need to pull this down locally and investigate.

[claudiogodoy99]

@jsquire I solve the CI issue, the problem is that the OpenAI.Examples.csproj project automatically includes all .cs files in its directory tree, including the ASP.NET Core files in the aspnet-core subdirectory.

To solve it I removed the aspnet-core subdirectory from the OpenAI.Examples.csproj compilation:

<ItemGroup>
    <!-- Exclude the aspnet-core subdirectory from compilation -->
    <Compile Remove="aspnet-core/**" />
    <Content Remove="aspnet-core/**" />
    <None Remove="aspnet-core/**" />
  </ItemGroup>

[jsquire]

@jsquire I solve the CI issue, the problem is that the OpenAI.Examples.csproj project automatically includes all .cs files in its directory tree, including the ASP.NET Core files in the aspnet-core subdirectory.

Thanks! You got there before I was able to loop back.

[jsquire]

Thank you, again, @claudiogodoy99!