Merge pull request #4 from SteveLasker/implementors

Adds Implementers of OCI Artifacts

Author: mikebrow

implementors.md

@@ -0,0 +1,12 @@
+# OCI Artifacts Implementations
+
+Registries currently supporting OCI Artifacts
+
+- [Amazon Container Registry](https://aws.amazon.com/blogs/containers/oci-artifact-support-in-amazon-ecr/)
+- [Azure Container Registry](https://aka.ms/acr/artifacts)
+- [CNCF Distribution](https://github.com/distribution/distribution/) 
+- [Project Harbor](https://goharbor.io/blog/harbor-2.0/)
+- [Quay.io](https://www.openshift.com/blog/quay-oci-artifact-support-for-helm-charts)
+_(to add your project, please open a [pull-request](https://github.com/opencontainers/artifacts/pulls))_
+
+[distribution-spec]: https://github.com/opencontainers/distribution-spec/