Create artifacts guidance

Signed-off-by: Brandon Mitchell <[email protected]>

Author: sudo-bmitch

artifacts-guidance.md

@@ -0,0 +1,5 @@
+# Guidance for Artifacts Authors
+
+Content other than OCI container images MAY be packaged using the image manifest.
+When this is done, the `config.mediaType` value MUST be set to a value specific to the artifact type or the [empty value](manifest.md#guidance-for-an-empty-descriptor).
+Additional details and examples are provided in the [image manifest specification](manifest.md#guidelines-for-artifact-usage).

spec.md

@@ -57,6 +57,7 @@ The high-level components of the spec include:
 * [Filesystem Layer](layer.md) - a changeset that describes a container's filesystem
 * [Image Configuration](config.md) - a document determining layer ordering and configuration of the image suitable for translation into a [runtime bundle][runtime-spec]
 * [Conversion](conversion.md) - a document describing how this translation should occur
+* [Artifacts Guidance](artifacts-guidance.md) - a document describing how to use the spec for packaging content other than OCI images
 * [Descriptor](descriptor.md) - a reference that describes the type, metadata and content address of referenced content
 
 Future versions of this specification may include the following OPTIONAL features: