Added example demonstrating creating an AIAgent using the Microsoft.AI.Extensions implementation of IChatClient using Dapr as the inference back-end provider pointing to Ollama in this example.

Motivation and Context

I'm the maintainer of the Dapr .NET SDK. In the last major release, I added a package to our SDK release to support IChatClient from Microsoft.Extensions.AI using Dapr's Conversation building block. As Microsoft only recently released this agentic framework, I was reading through the examples and saw a great opportunity to list the newly minted package as a sample agent implementation to the existing list.

Description

This doesn't change anything about the framework itself and only adds an agent provider to the existing list of samples. I've included a sample Dapr component file, provided instructions in the README at the project level explaining prerequisites and setup instructions and have otherwise minimized other changes (e.g. adding a line to the central package management under the appropriate section).

The other itself should otherwise be quite straightforward and keeping in line with the demonstration used in other similar samples.

Contribution Checklist

• The code builds clean without any errors or warnings
• The PR follows the Contribution Guidelines
• All unit tests pass, and I have added new tests where possible
• Is this a breaking change? If yes, add "[BREAKING]" prefix to the title of the PR.