Move supported platforms table to own file

README.md

@@ -29,22 +29,9 @@ your download on [Mullvad's Open Source page].
 
 ### Platform/OS support
 
-These are the operating systems and their versions that the app officially supports. It might
-work on many more versions, but we don't test for those and can't guarantee the quality or
-security.
-
-| OS/Platform | Supported versions |
-|-------------|--------------------|
-| Windows     | 10 and 11          |
-| macOS       | The three latest major releases |
-| Linux (Ubuntu)| The two latest LTS releases and the latest non-LTS releases |
-| Linux (Fedora) | The versions that are not yet [EOL](https://fedoraproject.org/wiki/End_of_life) |
-| Linux (Debian) | 12 and newer    |
-| Android     | 8 and newer        |
-| iOS         | 17.0 and newer     |
-
-On Linux we test using the Gnome desktop environment. The app should, and probably does work
-in other DEs, but we don't regularly test those.
+See [Supported Platforms](docs/supported-platforms.md) for details on which operating
+systems, versions and architectures are supported, and which ones are covered by our
+automated test suite.
 
 ## Features
 

docs/supported-platforms.md

@@ -0,0 +1,76 @@
+# Supported platforms
+
+These are the operating systems, versions and architectures that the app officially
+supports and actively tests. It might work on many more versions, but we don't
+test for those and can't guarantee the quality or security.
+
+We do not test all supported versions equally. Exhaustively testing every OS version
+for every target architecture is unrealistic as there are too many combinations.
+That's why this document exists, to better explain what is actually tested, and to
+what extent.
+
+## Types of testing
+
+- **e2e** - Automatic end-to-end integration testing. Runs extensive tests
+  automatically, both nightly and before releases.
+- **manual** - Thorough human testing of the app prior to making a release.
+
+## Windows
+
+Supported versions: 10 (Version 19H2 and newer) and 11. Both x64 and arm64.
+
+### Tested versions
+
+| Version        | Architecture | Type of test |
+|----------------|--------------|--------------|
+| 10 (21H2)     | x64          | e2e, manual  |
+
+## macOS
+
+Supported versions: The three most recent major releases. Both 64-bit Intel, and ARM.
+
+### Tested versions
+
+| Version          | Architecture | Type of test |
+|------------------|--------------|--------------|
+| 14 (Sonoma)     | Intel        | e2e          |
+| 15 (Sequoia)    | ARM          | e2e, manual  |
+
+## Linux
+
+Supported versions:
+- **Ubuntu**: The two latest LTS releases and the latest non-LTS releases
+- **Fedora**: Versions that are not yet [EOL](https://fedoraproject.org/wiki/End_of_life)
+- **Debian**: 12 and newer
+
+Both x86_64 and ARM64 is supported on all supported distributions.
+
+On Linux, we test using the Gnome desktop environment. The app should work in other
+DEs, but we don't regularly test those.
+
+### Tested versions
+
+| Distribution + version | Architecture | Type of test |
+|------------------------|--------------|--------------|
+| Debian 12              | x86_64       | e2e, manual  |
+
+## Android
+
+Supported versions: 8 and newer.
+
+### Tested versions
+
+| Version        | Architecture | Type of test |
+|----------------|--------------|--------------|
+| ...            |              |              |
+
+## iOS
+
+Supported versions: 17.0 and newer.
+
+### Tested versions
+
+| Version        | Type of test |
+|----------------|--------------|
+| 18             | manual       |
+| 26             | e2e, manual  |