Document which OS's are supported

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+# Operating Systems
+## Officially supported
+The following platforms are officially supported by the FreeRADIUS project, if FreeRADIUS fails to build or compile correctly of these platforms we consider this a bug, and you should [report it](http://bugs.freeradius.org).
+
+If you are not constrained in your choice of operating systems, for maximum performance and reliability the FreeRADIUS core team recommend [FreeBSD](http://www.freebsd.org/).
+
+* [FreeBSD](http://www.freebsd.org/)
+* [Linux](http://www.kernel.org/)
+  * [CentOS](http://www.centos.org/)
+  * [Red Hat](http://www.redhat.com/)
+  * [Debian](http://www.debian.org/)
+  * [Ubuntu](http://www.ubuntu.com/)
+* [macOS](http://www.apple.com/)
+* [Solaris](http://www.oracle.com/technetwork/server-storage/solaris11/overview/index.html)
+
+## Reported to work by the community
+FreeRADIUS is reported to run on the following Operating Systems:
+* [AIX](http://www.ibm.com/aix)
+* [Cygwin](http://www.cygwin.com/)
+* [FreeBSD](http://www.freebsd.org/)
+* [HP-UX](http://www.hp.com/products1/unix/)
+* [Linux](http://www.kernel.org/)
+  * [CentOS](http://www.centos.org/)
+  * [Debian](http://www.debian.org/)
+  * [Open Mandriva](https://www.openmandriva.org/)
+  * [Red Hat](http://www.redhat.com/)
+  * [SUSE](http://www.opensuse.org/)
+  * [Turbolinux](http://www.turbolinux.com/)
+  * [Ubuntu](http://www.ubuntu.com/)
+* [macOS](http://www.apple.com/)
+* [NetBSD](http://www.netbsd.org/)
+* [OpenBSD](http://www.openbsd.org/)
+* OSF/Unix
+* [Solaris](http://www.oracle.com/technetwork/server-storage/solaris11/overview/index.html)
+
+Porting to other unix-like platforms should be easy. Due to the limited resources of the FreeRADIUS development team, we are not able to test each version on all platforms before release.