Add guidance about the current state of the project (#119)

Signed-off-by: Michael Brown <brownxmi@amazon.com>

Author: michaelb990

README.md

@@ -1,3 +1,10 @@
+## Project Status
+There are no future releases or work items planned for this project.
+
+The output of this project has been proposed to the [OCI Reference Types Working Group](https://github.com/opencontainers/wg-reference-types) and we plan to archive this repository once the OCI releases those changes in a new version.
+
+Future discussions about artifacts in OCI registries should happen in the OCI [distribution-spec](https://github.com/opencontainers/distribution-spec) & [image-spec](https://github.com/opencontainers/image-spec) repositories.
+
 # ORAS Artifacts Specification
 
 [OCI Artifacts][oci-artifacts] generalized the ability to persist artifacts within an [OCI Distribution conformant][oci-conformance] registry enabling a wide range of *individual* artifacts.