README.md: Add Cloud Hypervisor specific details

Signed-off-by: Rob Bradford <robert.bradford@intel.com>

Author: rbradford

README.md

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+# Cloud Hypervisor Linux Fork
+
+Contains patches for:
+
+* virtio-iommu from https://jpbrucker.net/git/linux/log/?h=virtio-iommu/acpi (7616abe11cd1e0224bbd150626564db70bb07c31)
+* Support for virtio-watchdog
+* Bug fix: to support using ACPI reboot rather than EFI reboot
+