Create supported-os-matrix.md (#1923)

Adding a document that outlines goals for supported operating systems for the CLI

skip ci please

Documentation/supported-os-matrix.md

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+Supported OS Matrix for CLI
+===========================
+
+This document outlines the supported operating systems for the CLI. "Supported" is defined as a system on which we test 
+the CLI and on which we will make sure CLI works out-of-the-box (OOB). 
+
+This list is not a statement on the current state of things, but a statement of the end-goal. This means that at this time 
+CLI could work less than perfect on some of these systems, which is just a point-in-time thing in the development process.
+
+If your wanted system is not on this list, that doesn't mean that CLI will not work on it. It just means that we haven't 
+tested it out and we cannot guarantee that it will Just Work(tm).
+
+## Windows
+The following versions of Windows are supported:
+
+- Windows Server 2012 R2 (Full and Server Core) 
+- Windows Server 2012 SP1 (Full and Server Core) 
+- Windows Server 2008 R2 SP1 (Full and Server Core) 
+- Windows Server 2016 (Full, Server Core, and Nano) 
+- Windows 7 SP1 
+- Win 8.1 
+- Win 10
+
+## Linux (x64 only)
+The following versions of Linux are supported:
+
+- Debian 8.2
+- Ubuntu 14.04 LTS
+- CentOS 7.1
+- Red Hat Enterprise Linux 7.2
+
+## OS X (x64 only)
+The following versions of OS X are supported:
+
+- OS X 10.11+ (El Capitan)