Microsoft today released their Remote Desktop preview app for Windows 10 Mobile devices. This update version 844 supports Continuum for phone with compatible devices like the Lumia 950 or 950 XL. As Remote Desktop Preview is a Universal Windows App, the UI should be familiar as it is same as the one on Windows PC. You now have the option to connect to a remote PC (optionally through a Remote Desktop Gateway), access Remote Resources, manage a list of credentials and Gateways, and change global settings from your phone.
If you own a Lumia 950 or 950XL, you can use the Remote Desktop Preview client on a larger monitor or TV with Continuum. Continuum enables you to connect a capable mobile device to any screen with the Microsoft Display Dock or a Miracast capable device, and power a PC-like experience on that screen. You can attach a Bluetooth keyboard and mouse to your mobile device or a USB keyboard and mouse to the dock before connecting to a remote PC and using any apps (including Win32) that you have available in the remote session.
Read more about this update here and download the app from the below link.