Update quickstart-csharp.md

Minor fixes to make the C# sample work.

Author: polarapfel

articles/ai-services/agents/includes/quickstart-csharp.md

@@ -35,10 +35,18 @@ ms.date: 01/15/2025
 | Run       | Activation of an agent to begin running based on the contents of Thread. The agent uses its configuration and Thread’s Messages to perform tasks by calling models and tools. As part of a Run, the agent appends Messages to the Thread. |
 | Run Step  | A detailed list of steps the agent took as part of a Run. An agent can call tools or create Messages during its run. Examining Run Steps allows you to understand how the agent is getting to its results.                                |
 
+Create a .NET Console project.
+
+```console
+dotnet new console
+```
+
 Install the .NET package to your project. For example if you're using the .NET CLI, run the following command.
 
+Note: Azure.AI.Projects is only available as a prelease version. Please use the "-prerelease" flag to add the package until a release version becomes available.
+
 ```console
-dotnet add package Azure.AI.Projects
+dotnet add package Azure.AI.Projects --prerelease
 dotnet add package Azure.Identity
 ```