Added a Readme

Author: shnatara

Identity/README.md

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+# Azure Stack Identity
+
+
+```powershell
+Install-Module -Name AzureRM -RequiredVersion 1.2.8 -Scope CurrentUser
+Install-Module -Name AzureStack
+```
+Then make sure the following modules are imported:
+
+```powershell
+Import-Module ..\Connect\AzureStack.Connect.psm1
+Import-Module ..\Identity\AzureStack.Identity.psm1
+```
+
+You can create a Service Principal by executing the following command after importing the Identity Module
+
+```powershell
+$servicePrincipal = New-ADGraphServicePrincipal -DisplayName "myServicePrincipal" -AdminCredential $(Get-Credential) -Verbose
+```
+
+After the Service Principal is created, you should open your Azure Stack Portal to provide the appropriate level of RBAC to it. You can do this from the Access Control (IAM) tab of any resource. After the RBAC is given, you can login using the service principal as follows:
+
+```powershell
+Add-AzureRmAccount -EnvironmentName AzureStack-Tenant -ServicePrincipal -CertificateThumbprint $servicePrincipal.Thumbprint -ApplicationId $servicePrincipal.ApplicationId -TenantId "<yourTenantId>"
+```