Initial proposal for changes to the OCI specification

Signed-off-by: Marina Moore <mnm678@gmail.com>

Author: mnm678

oci-api-changes.md

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+The TUF + Notary design will require a few additions to the OCI specification.
+
+The specification will need to support the following media types:
+
+* A metadata type that refers to images or other metadata files. This can be a
+general type for any metadata, or could be broken into the following subtypes,
+described in more detail in the design:
+  * Targets metadata
+  * Snapshot metadata
+  * Timestamp metadata
+  * Root metadata
+
+  These metadata files will need to be accessed by name so that the user can
+  download the latest versions of them. This access by name could be achieved
+  using existing tag resolution mechanisms.