Clarify Windows installation bad + alternatives
These instructions are based on Ubuntu 20.04 LTS, which is the platform used by the OSMF servers.
The instructions also work, with only minor amendments, for all other current Ubuntu releases, Fedora and MacOSX
-We don't recommend attempting to develop or deploy this software on Windows. If you need to use Windows, then try developing this software using Ubuntu in a virtual machine, or use [Vagrant](VAGRANT.md).
+We don't recommend attempting to develop or deploy this software on Windows. Some Ruby gems may not be supported. If you need to use Windows the easiest solutions in order are [Docker](DOCKER.md), [Vagrant](VAGRANT.md), and Ubuntu in a virtual machine.
## Dependencies