Add 0.2.0 release notes.

Signed-off-by: Bill Nguyen <bill.nguyen@unsw.edu.au>

Author: dreamliner787-9

CHANGES.md

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+<!--
+     Copyright 2026, UNSW
+     SPDX-License-Identifier: CC-BY-SA-4.0
+-->
+
+# Revision history for libvmm
+
+## Release 0.1.0 (26/Mar/2025)
+
+This is the first proper release of libvmm, see the README and
+manual for getting started and what the library offers. The library
+has existed and been used internally by Trustworthy Systems for a
+while now but is starting to get used by others so it is time to
+start tagging and releasing versions.
+
+For subsequent releases, release notes will be published as well.
+
+## Release 0.2.0 (19/Aug/2026)
+
+This release introduces support for x86-64 VMs, along with many
+fixes to ARM virtualisation and the virtIO emulation layer.
+
+### Features
+
+#### ARM
+
+- Support booting a default configured Linux kernel with an initrd image.
+- Support guests with multiple cores (VCPUs) via PSCI.
+- Hardware-accelerated GIC virtualisation.
+
+#### x86
+
+- ACPI implementation.
+- Support booting a default configured Linux kernel with an initrd image.
+- Support booting any EFI guest from block storage or PXE via TianoCore OVMF firmware.
+- Only support guests with a single VCPU.
+- Software virtualised APIC in xAPIC mode and single I/O APIC.
+
+#### Guest-facilities
+
+- VirtIO MMIO and PCI transports.
+- Networking via virtIO Network, either through a NIC or Virtual Switch.
+- Storage via virtIO Block.
+- Console via serial passthrough, virtIO Console or SSH.