Add proposed stucture for samples and user documentation (#484)

dotnet/samples/GettingStartedSteps/README.md

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+# Getting started steps
+
+The getting started steps samples demonstrate the fundamental concepts and functionalities
+of the agent framework and can be used with any agent type.
+
+While the functionality can be used with any agent type, these samples use Azure OpenAI as the AI provider
+and use ChatCompletion as the type of service.
+
+For other samples that demonstrate how to create and configure each type of agent that come with the agent framework,
+see the [Agent setup](../AgentSetup/README.md) samples.
+
+## Getting started steps prerequisites
+
+Before you begin, ensure you have the following prerequisites:
+
+- .NET 8.0 SDK or later
+- Azure OpenAI service endpoint and deployment configured
+- Azure CLI installed and authenticated (for Azure credential authentication)
+
+**Note**: This demo uses Azure CLI credentials for authentication. Make sure you're logged in with `az login` and have access to the Azure OpenAI resource. For more information, see the [Azure CLI documentation](https://learn.microsoft.com/cli/azure/authenticate-azure-cli-interactively).
+
+## Samples
+
+|Sample|Description|
+|---|---|
+|[Running a simple agent](./Step01_ChatClientAgent_Running/)|This sample demonstrates how to create and run a basic agent with instructions|
+|[Multi-turn conversation with a simple agent](./Step02_ChatClientAgent_MultiTurn/)|This sample demonstrates how to implement a multi-turn conversation with a simple agent|
+
+## Running the samples from the console
+
+To run the samples, navigate to the desired sample directory, e.g.
+
+```powershell
+cd Step01_ChatClientAgent_Running
+```
+
+Set the following environment variables:
+
+```powershell
+$env:AZURE_OPENAI_ENDPOINT="https://your-resource.openai.azure.com/" # Replace with your Azure OpenAI resource endpoint
+$env:AZURE_OPENAI_DEPLOYMENT_NAME="gpt-4o-mini"  # Optional, defaults to gpt-4o-mini
+```
+
+If the variables are not set, you will be prompted for the values when running the samples.
+
+Execute the following command to build the sample:
+
+```powershell
+dotnet build
+```
+
+Execute the following command to run the sample:
+
+```powershell
+dotnet run --no-build
+```
+
+Or just build and run in one step:
+
+```powershell
+dotnet run
+```
+
+## Running the samples from Visual Studio
+
+Open the solution in Visual Studio and set the desired sample project as the startup project. Then, run the project using the built-in debugger or by pressing `F5`.
+
+You will be prompted for any required environment variables if they are not already set.