Support lifecycle doc (#1994)

* first pass of support lifecycle doc

* add notes on MIT license

* address slee's comments on support lifecycle

* respond to lifecycle feedback from Sean

* add lifecycle image

* Fixed spelling typo

* add lifecycle to TOC

* respond to feedback on lifecycle

* Removed en-us from URLs

You need to remove locale paths from URLs. Including en-us forces the reader to English rather than being redirected to the localized version of the article that matches their locale.

* add note on 12 months, fix en-us

* Fixed typo

Author: joeyaiello

reference/docs-conceptual/PowerShell-Core-Support.md

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+# PowerShell Core Support Lifecycle
+
+PowerShell Core is a distinct set of tools and components that is shipped, installed, and configured separately from Windows PowerShell.
+Therefore, PowerShell Core is not included in the Windows 7/8.1/10 or Windows Server licensing agreements.
+
+However, PowerShell Core is supported under traditional Microsoft support agreements, including [Premier][], [Microsoft Enterprise Agreements][enterprise-agreement], and [Microsoft Software Assurance][assurance].
+You can also pay for [assisted support][] for PowerShell Core by filing a support request for your problem.
+
+We also offer [community support][] on GitHub where you can file an issue, bug, or feature request.
+Alternatively, you may find help from other members of the community on the general [Microsoft Community][] or the Microsoft [PowerShell Tech Community][].
+We offer no guarantee there that your issue will be addressed or resolved in a timely manner.
+If you have a problem that requires immediate attention,
+you should use the traditional, paid support options.
+
+## Lifecycle of PowerShell Core
+
+PowerShell Core is adopting the [Microsoft Modern Lifecycle Policy][modern].
+This support lifecycle is intended to keep customers up-to-date with the latest versions.
+
+The version 6.x branch of PowerShell Core will be updated approximately once every six months (e.g. 6.0, 6.1, 6.2, etc.)
+
+> [!IMPORTANT]
+> You must update within six months after each new minor version release to continue receiving support.
+
+For example, if PowerShell Core 6.1 is released on July 1st, 2018,
+you would be expected to update to PowerShell Core 6.1 by January 1st, 2019 to maintain support.
+
+![PowerShell Core branch lifecycle][lifecycle-chart]
+
+The Modern Lifecycle Policy also requires that Microsoft give customers 12 months notice before discontinuing support for a product (i.e. PowerShell Core).
+
+Eventually, we expect PowerShell Core will adopt the "long-term servicing" approach where we would require only servicing and security updates to stay in support on a specific branch/version of 6.x.
+
+## Supported platforms
+
+PowerShell Core is officially supported on the following platforms:
+
+* Windows 7, 8.1, and 10
+* Windows Server 2008 R2, 2012 R2, 2016
+* [Windows Server Semi-Annual Channel][semi-annual]
+* Ubuntu 14.04, 16.04, and 17.04
+* Debian 8.7+, and 9
+* CentOS 7
+* Red Hat Enterprise Linux 7
+* OpenSUSE 42.2
+* Fedora 25, 26
+* macOS 10.12+
+
+Our community has also contributed packages for the following platforms,
+but they are not officially suppported:
+
+* Arch Linux
+* Kali Linux
+* AppImage (works on multiple Linux platforms)
+
+## Notes on licensing
+
+PowerShell Core is released under the [MIT license][].
+Under this license, and in the absence of a paid support agreement,
+users are limited to [community support][].
+With community support, Microsoft makes no guarantees of responsiveness or fixes.
+
+## Windows PowerShell Module
+
+Support for PowerShell Core does not extend to other product modules unless those modules explicitly support PowerShell Core.
+For example, using the `ActiveDirectory` module that ships as part of Windows Server is an unsupported scenario.
+
+However, modules that do not explicitly support PowerShell Core may be compatible in some cases.
+By installing the [`WindowsPSModulePath`][] module,
+you can append the Windows PowerShell `PSModulePath` to your PowerShell Core `PSModulePath`.
+
+First, install the `WindowsPSModulePath` module from the PowerShell Gallery:
+
+```powershell
+# Add `-Scope CurrentUser` if you're installing as non-admin 
+Install-Module WindowsPSModulePath -Force
+```
+
+After installing this module, run the `Add-WindowsPSModulePath` cmdlet to add the Windows PowerShell `PSModulePath` to PowerShell Core:
+
+```powershell
+# Add this line to your profile if you always want Windows PowerShell PSModulePath
+Add-WindowsPSModulePath
+```
+
+[Premier]: https://www.microsoft.com/en-us/microsoftservices/support.aspx
+[enterprise-agreement]: https://www.microsoft.com/en-us/licensing/licensing-programs/enterprise.aspx
+[assurance]: https://www.microsoft.com/en-us/licensing/licensing-programs/software-assurance-default.aspx
+[community support]: https://github.com/powershell/powershell/issues
+[Microsoft Community]: https://answers.microsoft.com/
+[PowerShell Tech Community]: https://techcommunity.microsoft.com/t5/PowerShell/ct-p/WindowsPowerShell
+[assisted support]: https://support.microsoft.com/assistedsupportproducts
+[modern]: https://support.microsoft.com/help/30881/modern-lifecycle-policy
+[lifecycle-chart]: ./images/modern-lifecycle.png
+[semi-annual]: https://docs.microsoft.com/windows-server/get-started/semi-annual-channel-overview
+[MIT license]: https://github.com/PowerShell/PowerShell/blob/master/LICENSE.txt
+[`WindowsPSModulePath`]: https://www.powershellgallery.com/packages/WindowsPSModulePath/

reference/docs-conceptual/images/modern-lifecycle.png

@@ -240,5 +240,7 @@
       href: whats-new/what-s-new-in-windows-powershell-50.md
     - name: What's New With PowerShell
       href: whats-new/what-s-new-with-powershell.md
+  - name: PowerShell Core Support Lifecycle
+    href: PowerShell-Core-Support.md
   - name: Glossary
     href: windows-powershell-glossary.md