.NET Workflows - Update structure of samples (#645)

* Updated

* Typos

* Update readme fwiw

dotnet/samples/GettingStarted/Workflows/Declarative/README.md

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+# Summary
+
+This demo showcases the ability to parse a declarative Foundry Workflow file (YAML) to build a `Workflow<>`
+be executed using the same pattern as any code-based workflow.
+
+## Configuration
+
+This demo requires configuration to access agents an [Azure Foundry Project](https://learn.microsoft.com/azure/ai-foundry).
+
+#### Settings
+
+We suggest using .NET [Secret Manager](https://learn.microsoft.com/en-us/aspnet/core/security/app-secrets) 
+to avoid the risk of leaking secrets into the repository, branches and pull requests. 
+You can also use environment variables if you prefer.
+
+To set your secrets as an environment variable (PowerShell):
+
+```pwsh
+$env:FOUNDRY_PROJECT_ENDPOINT="https://..."
+```
+
+To set your secrets with .NET Secret Manager:
+
+1. From the root of the repository, navigate the console to the project folder:
+
+    ```
+    cd dotnet/samples/GettingStarted/Workflows/Declarative
+    ```
+
+2. Examine existing secret definitions:
+
+    ```
+    dotnet user-secrets list
+    ```
+
+3. If needed, perform first time initialization:
+
+    ```
+    dotnet user-secrets init
+    ```
+
+4. Define setting that identifies your Azure Foundry Project (endpoint):
+
+    ```
+    dotnet user-secrets set "FOUNDRY_PROJECT_ENDPOINT" "https://..."
+    ```
+
+#### Authorization
+
+Use [_Azure CLI_](https://learn.microsoft.com/cli/azure/authenticate-azure-cli) to authorize access to your Azure Foundry Project:
+
+```
+az login
+az account get-access-token
+```
+
+#### Agents
+
+The sample workflows rely on agents defined in your Azure Foundry Project.
+
+To create agents, run the [`Create.ps1`](../../../../../workflows/) script.
+This will create the agents used in the sample workflows in your Azure Foundry Project and format a script you can copy and use to configure your environment.
+
+> Note: `Create.ps1` relies upon the `FOUNDRY_PROJECT_ENDPOINT` setting.
+
+## Execution
+
+Run the demo from the console by specifying a path to a declarative (YAML) workflow file.  
+The repository has example workflows available in the root [`/workflows`](../../../../../workflows) folder.
+
+1. From the root of the repository, navigate the console to the project folder:
+
+    ```sh
+    cd dotnet/samples/GettingStarted/Workflows/Declarative
+    ```
+
+2. Run the demo referencing a sample workflow by name:
+
+    ```sh
+    dotnet run HelloWorld
+    ```
+
+3. Run the demo with a path to any workflow file:
+
+    ```sh
+    dotnet run c:/myworkflows/HelloWorld.yaml
+    ```