Create supported-os.md for .NET 9

release-notes/9.0/supported-os.md

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+# .NET 9 - Supported OS versions
+
+[.NET 9](README.md) is a [Standard Term Support (STS)](../../release-policies.md) release and [is supported](../../microsoft-support.md) on multiple operating systems per their lifecycle policy.
+
+For issues with .NET on operating systems not listed here, please open a GitHub issue in the appropriate .NET repository or contact the OS maintainer community. See [.NET Repos](../../Documentation/core-repos.md) for the repository list.
+
+## Windows
+
+OS                                    | Version                 | Architectures   | Lifecycle
+--------------------------------------|-------------------------|-----------------|----------
+[Windows 10 Client][Windows-client]   | Version 1607+           | x64, x86, Arm64 | [Windows][Windows-lifecycle]
+[Windows 11][Windows-client]          | Version 22000+          | x64, x86, Arm64 | [Windows][Windows-lifecycle]
+[Windows Server][Windows-Server]      | 2012+                   | x64, x86        | [Windows Server][Windows-Server-lifecycle]
+[Windows Server Core][Windows-Server] | 2012+                   | x64, x86        | [Windows Server][Windows-Server-lifecycle]
+[Nano Server][Nano-Server]            | Version 1809+           | x64             | [Windows Server][Windows-Server-lifecycle]
+
+[Windows-client]: https://www.microsoft.com/windows/
+[Windows-lifecycle]: https://support.microsoft.com/help/13853/windows-lifecycle-fact-sheet
+[win-client-docker]: https://hub.docker.com/_/microsoft-windows
+[Windows-Server-lifecycle]: https://learn.microsoft.com/windows-server/get-started/windows-server-release-info
+[Nano-Server]: https://learn.microsoft.com/windows-server/get-started/getting-started-with-nano-server
+[Windows-Server]: https://learn.microsoft.com/windows-server/
+
+.NET 8 is supported in the x64 emulator on Windows 11 Arm64.
+
+## Linux
+
+OS                                    | Version               | Architectures     | Lifecycle
+--------------------------------------|-----------------------|-------------------|----------
+[Alpine Linux][Alpine]                | 3.17+                 | x64, Arm64, Arm32 | [Alpine][Alpine-lifecycle]
+[Debian][Debian]                      | 11+                   | x64, Arm64, Arm32 | [Debian][Debian-lifecycle]
+[Fedora][Fedora]                      | 38+                   | x64               | [Fedora][Fedora-lifecycle]
+[openSUSE][OpenSUSE]                  | 15+                   | x64               | [OpenSUSE][OpenSUSE-lifecycle]
+[Oracle Linux][Oracle-Linux]          | 8+                    | x64               | [Oracle][Oracle-lifecycle]
+[Red Hat Enterprise Linux][RHEL]      | 8+                    | x64, Arm64        | [Red Hat][RHEL-lifecycle]
+[SUSE Enterprise Linux (SLES)][SLES]  | 12 SP5+               | x64               | [SUSE][SLES-lifecycle]
+[Ubuntu][Ubuntu]                      | 20.04+                | x64, Arm64, Arm32 | [Ubuntu][Ubuntu-lifecycle]
+
+Other distributions are supported at best effort, per [.NET Support and Compatibility for Linux Distributions](../../linux-support.md).
+
+### Libc compatibility
+
+- [glibc][glibc] 2.23 (from Ubuntu 16.04)
+- Alpine: [musl][musl] 1.2.2 (from Alpine 3.13)
+
+[Alpine]: https://alpinelinux.org/
+[Alpine-lifecycle]: https://alpinelinux.org/releases/
+[CentOS]: https://www.centos.org/
+[CentOS-lifecycle]:https://wiki.centos.org/FAQ/General
+[CentOS-docker]: https://hub.docker.com/_/centos
+[CentOS-pm]: https://learn.microsoft.com/dotnet/core/install/linux-package-manager-centos8
+[Debian]: https://www.debian.org/
+[Debian-lifecycle]: https://wiki.debian.org/DebianReleases
+[Debian-pm]: https://learn.microsoft.com/dotnet/core/install/linux-package-manager-debian10
+[Fedora]: https://getfedora.org/
+[Fedora-lifecycle]: https://fedoraproject.org/wiki/End_of_life
+[Fedora-docker]: https://hub.docker.com/_/fedora
+[Fedora-msft-pm]: https://learn.microsoft.com/dotnet/core/install/linux-package-manager-fedora32
+[Fedora-pm]: https://fedoraproject.org/wiki/DotNet
+[OpenSUSE]: https://opensuse.org/
+[OpenSUSE-lifecycle]: https://en.opensuse.org/Lifetime
+[OpenSUSE-docker]: https://hub.docker.com/r/opensuse/leap
+[OpenSUSE-pm]: https://learn.microsoft.com/dotnet/core/install/linux-package-manager-opensuse15
+[Oracle-Linux]: https://www.oracle.com/linux/
+[Oracle-Lifecycle]: https://www.oracle.com/a/ocom/docs/elsp-lifetime-069338.pdf
+[RHEL]: https://www.redhat.com/en/technologies/linux-platforms/enterprise-linux
+[RHEL-lifecycle]: https://access.redhat.com/support/policy/updates/errata/
+[RHEL-msft-pm]: https://learn.microsoft.com/dotnet/core/install/linux-package-manager-rhel8
+[RHEL-pm]: https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/developing_.net_applications_in_rhel_8/using-net-core-on-rhel_gsg#installing-net-core_gsg
+[SLES]: https://www.suse.com/products/server/
+[SLES-lifecycle]: https://www.suse.com/lifecycle/
+[SLES-pm]: https://learn.microsoft.com/dotnet/core/install/linux-package-manager-sles15
+[Ubuntu]: https://ubuntu.com/
+[Ubuntu-lifecycle]: https://wiki.ubuntu.com/Releases
+[Ubuntu-pm]: https://learn.microsoft.com/dotnet/core/install/linux-package-manager-ubuntu-2004
+[glibc]: https://www.gnu.org/software/libc/
+[musl]: https://musl.libc.org/
+
+## macOS
+
+OS                            | Version                   | Architectures     |
+------------------------------|---------------------------|-------------------|
+[macOS][macOS]                | 12.0+                     | x64, Arm64        |
+
+.NET 8 is supported in the Rosetta 2 x64 emulator.
+
+[macOS]: https://support.apple.com/macos
+
+## Android
+
+OS                            | Version                 | Architectures     |
+------------------------------|-------------------------|-------------------|
+[Android][Android]            | API 21+                 | x64, Arm32, Arm64 |
+
+[Android]: https://support.google.com/android
+
+## iOS / tvOS / MacCatalyst
+
+OS                            | Version                 | Architectures     |
+------------------------------|-------------------------|-------------------|
+[iOS][iOS]                    | 12.0+                   | Arm64             |
+[iOS Simulator][iOS]          | 12.0+                   | x64, Arm64        |
+[tvOS][tvOS]                  | 12.0+                   | Arm64             |
+[tvOS Simulator][tvOS]        | 12.0+                   | x64, Arm64        |
+[MacCatalyst][macOS]          | 12.0+                   | x64, Arm64        |
+
+[iOS]: https://support.apple.com/ios
+[tvOS]: https://support.apple.com/apple-tv
+
+## QEMU
+
+.NET 8 is not supported being run (emulated) via [QEMU](https://www.qemu.org/). QEMU is used, for example, to emulate Arm64 containers on x64, and vice versa.
+
+## Support changes from .NET 6.0
+
+The following operating systems are no longer supported, starting with .NET 7.0.
+
+OS                                    | Version                 | Architectures     |
+--------------------------------------|-------------------------|-------------------|
+[Windows Client][Windows-client]      | 7 SP1, 8.1      | x64, x86          |
+
+## Out of support OS versions
+
+Support for the following versions was ended by the distribution owners and are [no longer supported by .NET 9.0][OS-lifecycle-policy].
+
+None yet.
+
+[OS-lifecycle-policy]: https://github.com/dotnet/core/blob/main/os-lifecycle-policy.md