Create README for App Configuration sample

samples/appconfiguration/create-app-configuration/README.md

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+---
+page_type: sample
+languages:
+- csharp
+products:
+- azure
+description: "This code samples will show you how to create an App Configuration using Azure SDK for .NET."
+urlFragment: appconfiguration-create-appconfiguration
+---
+# Getting started - Creating App Configurations using Azure .NET SDK
+
+This code sample will show you how to create an App Configuration using Azure SDK for .NET.
+
+## Features
+
+This project framework provides examples for the following services:
+
+### EventHub
+* You can find the details for the library [here](https://azure.github.io/azure-sdk/releases/latest/#dotnet).
+
+## Getting Started
+
+### Prerequisites
+
+You will need the following values to authenticate to Azure
+
+-   **Subscription ID**
+-   **Client ID**
+-   **Client Secret**
+-   **Tenant ID**
+
+These values can be obtained from the portal, here's the instructions:
+
+### Get Subscription ID
+
+1.  Login into your Azure account
+2.  Select Subscriptions in the left sidebar
+3.  Select whichever subscription is needed
+4.  Click on Overview
+5.  Copy the Subscription ID
+
+### Get Client ID / Client Secret / Tenant ID
+
+For information on how to get Client ID, Client Secret, and Tenant ID,
+please refer to [this
+document](https://docs.microsoft.com/azure/active-directory/develop/howto-create-service-principal-portal)
+
+### Setting Environment Variables
+
+After you obtained the values, you need to set the following values as
+your environment variables
+
+-   `AZURE_CLIENT_ID`
+-   `AZURE_CLIENT_SECRET`
+-   `AZURE_TENANT_ID`
+-   `AZURE_SUBSCRIPTION_ID`
+
+To set the following environment variables on your development system:
+
+Windows (Note: Administrator access is required)
+
+1.  Open the Control Panel
+2.  Click System Security, then System
+3.  Click Advanced system settings on the left
+4.  Inside the System Properties window, click the Environment
+    Variables… button.
+5.  Click on the property you would like to change, then click the Edit…
+    button. If the property name is not listed, then click the New…
+    button.
+
+Linux-based OS :
+
+    export AZURE_CLIENT_ID="__CLIENT_ID__"
+    export AZURE_CLIENT_SECRET="__CLIENT_SECRET__"
+    export AZURE_TENANT_ID="__TENANT_ID__"
+    export AZURE_SUBSCRIPTION_ID="__SUBSCRIPTION_ID__"
+
+### Installation
+
+To complete this tutorial:
+
+* Install .NET Core latest version for [Linux] or [Windows]
+
+If you don't have an Azure subscription, create a [free account] before you begin.
+
+### Quickstart
+
+1. Clone the repository on your machine:
+
+```bash
+git clone https://github.com/Azure-Samples/azure-samples-net-management.git
+```
+
+2. Switch to the project folder:
+```bash
+cd samples/appconfiguration/create-app-configuration
+```
+
+3. Run the application with the `dotnet run` command.
+
+```console
+dotnet run
+```
+
+## This sample shows how to create an App Configuration 
+
+## More information
+
+The [Azure Compute documentation] includes a rich set of tutorials and conceptual articles, which serve as a good complement to the samples.
+
+This project has adopted the [Microsoft Open Source Code of Conduct].
+For more information see the [Code of Conduct FAQ] or contact [opencode@microsoft.com] with any additional questions or comments.
+
+<!-- LINKS -->
+[Linux]: https://dotnet.microsoft.com/download
+[Windows]: https://dotnet.microsoft.com/download
+[free account]: https://azure.microsoft.com/free/?WT.mc_id=A261C142F
+[Azure Portal]: https://portal.azure.com
+[Azure Compute documentation]: https://docs.microsoft.com/azure/?product=compute
+[Microsoft Open Source Code of Conduct]: https://opensource.microsoft.com/codeofconduct/
+[Code of Conduct FAQ]: https://opensource.microsoft.com/codeofconduct/faq/
+[opencode@microsoft.com]: mailto:opencode@microsoft.com