Add readme

README.md

+GO Remote Desktop Gateway
+=========================
+
+:star: Star us on GitHub — it helps!
+
+RDPGW is an implementation of the [Remote Desktop Gateway protocol](https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-tsgu/0007d661-a86d-4e8f-89f7-7f77f8824188).
+This allows you connect with the official Microsoft clients to remote desktops that are made available over HTTPS. 
+These desktops could be, for example, [XRDP](http://www.xrdp.org) desktops running in containers
+on Kubernetes.
+
+## AIM
+RDPGW aims to provide a full open source replacement for MS Remote Desktop Gateway, 
+including access policies.
+
+## TODO
+* Integrate VIPER
+* Integrate Open Policy Agent
+* Integrate GOKRB5
+* Integrate uber-go/zap
+* Research: TLS defragmentation 
+
+## How to build
+go build rdg.go main.go http.go errors.go
+
+## How to run
+./rdg