chore: Added app authentication readme

Author: Avijit-Microsoft

content-gen/docs/AppAuthentication.md

@@ -0,0 +1,32 @@
+# Set Up Authentication in Azure App Service
+
+This document provides step-by-step instructions to configure Azure App Registrations for a front-end application.
+
+## Prerequisites
+
+- Access to **Microsoft Entra ID**
+- Necessary permissions to create and manage **App Registrations**
+  
+## Step 1: Add Authentication in Azure App Service configuration
+1. Click on `Authentication` from left menu.
+
+  ![Authentication](images/AppAuthentication.png)
+
+2. Click on `+ Add identity provider` to see a list of identity providers.
+
+  ![Authentication Identity](images/AppAuthenticationIdentity.png)
+
+3. Click on `Identity Provider` dropdown to see a list of identity providers.
+
+  ![Add Provider](images/AppAuthIdentityProvider.png)
+
+4. Select the first option `Microsoft Entra Id` from the drop-down list and select `client secret expiration` under App registration.
+> NOTE: If `Create new app registration` is disabled, then go to [Create new app registration](create_new_app_registration.md) and come back to this step to complete the app authentication.
+ 
+ ![Add Provider](images/AppAuthIdentityProviderAdd.png)
+
+5. Accept the default values and click on `Add` button to go back to the previous page with the identity provider added.
+
+ ![Add Provider](images/AppAuthIdentityProviderAdded.png)
+
+6. You have successfully added app authentication, and now required to log in to access the application.

content-gen/docs/create_new_app_registration.md

@@ -0,0 +1,35 @@
+# Creating a new App Registration
+
+1. Click on `Home` and select `Microsoft Entra ID`.
+
+![Microsoft Entra ID](images/MicrosoftEntraID.png)
+
+2. Click on `App registrations`.
+
+![App registrations](images/Appregistrations.png)
+
+3. Click on `+ New registration`.
+
+![New Registrations](images/NewRegistration.png)
+
+4. Provide the `Name`, select supported account types as `Accounts in this organizational directory only(Contoso only - Single tenant)`, select platform as `Web`, enter/select the `URL` and register.
+
+![Add Details](images/AddDetails.png)
+
+5. After application is created successfully, then click on `Add a Redirect URL`.
+
+![Redirect URL](images/AddRedirectURL.png)
+
+6. Click on `+ Add a platform`.
+
+![+ Add platform](images/AddPlatform.png)
+
+7. Click on `Web`.
+
+![Web](images/Web.png)
+
+8. Enter the `web app URL` (Provide the app service name in place of XXXX) and Save. Then go back to [Set Up Authentication in Azure App Service](AppAuthentication.md) Step 1 page and follow from _Point 4_ choose `Pick an existing app registration in this directory` from the Add an Identity Provider page and provide the newly registered App Name.
+
+E.g. <<https://<< appservicename >>.azurewebsites.net/.auth/login/aad/callback>>
+
+![Add Details](images/WebAppURL.png)