Update README.md

[CakeRepository]

Was unable to get this to work without changing HumanInputMode.ALWAYS for Azure OpenAI model IDE would not compile

Why are these changes needed?

Unable to compile until changing

Related issue number

Checks

• I've included any doc changes needed for https://microsoft.github.io/autogen/. See https://github.com/microsoft/autogen/blob/main/CONTRIBUTING.md to build and test documentation locally.
• I've added tests (if relevant) corresponding to the changes introduced in this PR.
• I've made sure all auto checks have passed.

[Copilot]

Pull Request Overview

This PR updates the .NET README example to fix a compilation error by simplifying the enum reference.

• Removed the ConversableAgent. qualifier from HumanInputMode.ALWAYS
• Adjusted the code snippet so it compiles without errors

Comments suppressed due to low confidence (1)

dotnet/README.md:43

• Add a using directive or fully qualify the namespace for HumanInputMode in the README example to ensure it compiles (e.g., using Microsoft.Autogen; or ConversableAgent.HumanInputMode).

humanInputMode: HumanInputMode.ALWAYS)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.40%. Comparing base (8c5dcab) to head (952d50f).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6506      +/-   ##
==========================================
- Coverage   79.52%   75.40%   -4.12%     
==========================================
  Files         225      331     +106     
  Lines       16661    19779    +3118     
  Branches        0      406     +406     
==========================================
+ Hits        13249    14914    +1665     
- Misses       3412     4592    +1180     
- Partials        0      273     +273     

Flag	Coverage Δ
unittests	75.40% <ø> (-4.12%)	⬇️

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