* add samples for OpenAIChatClientAgent and OpenAIResponseClientAgent * Update dotnet/samples/GettingStarted/AgentWithOpenAI/README.md Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> * Update dotnet/samples/GettingStarted/AgentWithOpenAI/Agent_OpenAI_Step03_CreateFromChatClient/README.md Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> * Update dotnet/samples/GettingStarted/AgentWithOpenAI/Agent_OpenAI_Step03_CreateFromChatClient/README.md Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> --------- Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>