CodeGen from PR 12943 in Azure/azure-rest-api-specs

Update redisenterprise readme files for C#, Azure CLI, and Azure Resource Manager Schema (#12943)

* Update readme files for csharp, az cli, and azureresourceschema

* Fix spelling mistake

* Fix bug from issue 744

* Add newline to end of readme files

* First round of updates for Azure CLI code generation

Author: SDKAuto