Add VS Code tasks for CopilotChat project

[lemillermicrosoft]

This commit adds three tasks to the .vscode/tasks.json file for building, running, and watching the CopilotChatApi project. These tasks allow developers to easily launch and debug the WebApi service using VS Code. The commit also updates the README.md file with instructions on how to use the VS Code tasks. Additionally, the commit fixes some minor formatting issues in the README.md file.

Contribution Checklist

• [x] The code builds clean without any errors or warnings
• [x] The PR follows SK Contribution Guidelines (https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md)
• [x] The code follows the .NET coding conventions (https://learn.microsoft.com/dotnet/csharp/fundamentals/coding-style/coding-conventions) verified with dotnet format
• [x] All unit tests pass, and I have added new tests where possible
• [x] I didn't break anyone :smile:

[markwallace-microsoft]

@lemillermicrosoft I'm adding support to use Copilot Chat as a starter for the SK Tools and this will help. We'll also need to add a launch.json, do you want to include that as part of this PR?

[lemillermicrosoft]

@lemillermicrosoft I'm adding support to use Copilot Chat as a starter for the SK Tools and this will help. We'll also need to add a launch.json, do you want to include that as part of this PR?

Might be best to do that separately -- I was just building these for myself for some work I'm doing and wanted to share them with others as a starting point. But I agree, probably good to have a launch.json as well.