doc: Added a document outlining the supported hosts for vfkit

Author: vyasgun

doc/supported_platforms.md

@@ -0,0 +1,19 @@
+# Supported Host Platforms
+
+`vfkit` is a macOS-only virtualization tool which uses Apple's Virtualization framework to manage virtual machines. 
+
+## Host Requirements
+
+**macOS 14.0 or later** is recommended and fully supported. CI tested on:
+- macOS 14 (Sonoma) - CI tested on Apple Silicon  
+- macOS 15 (Sequoia) - CI tested on Apple Silicon
+
+**macOS 13.0** may work but is not officially supported. Integration tests currently run on macOS 13, but this GitHub Actions runner will be deprecated soon. See: https://github.blog/changelog/2025-07-11-upcoming-changes-to-macos-hosted-runners-macos-latest-migration-and-xcode-support-policy-updates/#macos-13-is-closing-down
+
+**Architectures:**
+- Intel x86_64
+- Apple Silicon
+
+## Limitations
+
+- **Raw block devices**: Using raw block devices like `/dev/disk1` requires macOS 14+. See Apple's [VZDiskBlockDeviceStorageDeviceAttachment](https://developer.apple.com/documentation/virtualization/vzdiskblockdevicestoragedeviceattachment) documentation.