image-types/rhel8: add kvm, azure, and vmware

These are fairly bare-bones right now, but include them for
completeness.

image-types/rhel8/kvm-guest-image.md

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+# KVM Guest Image
+
+This is an image meant to be used as a generic base image for various
+virtualization environments.
+
+To be usable in common environments, it is provided in the *qcow2* format and
+has *cloud-init* installed and enabled.
+
+
+## Implementation Choices
+
+`dracut-config-rescue` is excluded from the image, because the boot loader
+entry it provides is broken.
+
+The environments this image is meant to be used in usually don't require any
+specialized firmware. Thus, in order to keep the resulting image size small,
+all `-firmware` packages are excluded. An exception is the `linux-firmware`
+package, which cannot be excluded because the `kernel` package depends on it.

image-types/rhel8/microsoft-azure.md

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+# Microsoft Azure Image
+
+This image is meant to be used in [Microsoft Azure][azure], a popular cloud
+computing platform. It conforms to Azure's requirements for images.
+
+
+[azure]: https://azure.microsoft.com

image-types/rhel8/vmware.md

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+# VMWare Image
+
+This image is meant to be used in various VMWare environments, such as
+[vSphere][vsphere].
+
+
+[vsphere]: https://www.vmware.com/products/vsphere.html