I am using Remote Desktop App on IOS 10 to access Windows Server 2012 R2 in my office. Apple TV 4th generation comes with tvOS 10 which is almost similar to IOS 10. Apple TV 4 also supports Bluetooth Keyboard and New Siri Remote for Apple TV 4 has
trackpad which i assume can be used as mouse.
Taking these facts into consideration, i am assuming it wont be difficult for you as developers to have Microsoft Remote Desktop Client for Apple TV 4 platform.
Thank You.