Update readme kv (#11082)

* Update readme to point to the new libraries

* Remove formatting

* PR feedback

* Update README.md

sdk/keyvault/Microsoft.Azure.KeyVault/README.md

@@ -1,4 +1,18 @@
-# Microsoft Azure Keyvault SDK for .NET
+# Microsoft Azure Key Vault SDK for .NET
+
+## New libraries available
+
+This library has been replaced by the following new Azure SDKs. You can read about the new Azure SDKs at https://aka.ms/azsdkvalueprop.
+
+The latest libraries to interact with the Azure Key Vault service are:
+
+* [Azure.Security.KeyVault.Certificates](https://github.com/Azure/azure-sdk-for-net/tree/master/sdk/keyvault/Azure.Security.KeyVault.Certificates)
+* [Azure.Security.KeyVault.Keys](https://github.com/Azure/azure-sdk-for-net/tree/master/sdk/keyvault/Azure.Security.KeyVault.Keys)
+* [Azure.Security.KeyVault.Secrets](https://github.com/Azure/azure-sdk-for-net/tree/master/sdk/keyvault/Azure.Security.KeyVault.Secrets)
+
+It is **recommended** that you move to one or more of the new packages.
+
+<hr/>
 
 The Microsoft Azure Key Vault SDK for .NET allows you to build secure Azure applications that can access secrets, keys, and certificates that a encrypted at rest with hardware security modules.