Add metadata packaging documentation

doc/akri_connector/packaging-metadata-for-connector

@@ -0,0 +1,20 @@
+# How to package connector metadata for connector images
+
+In order for the user of a connector to access the metadata associated with it, the publisher of a connector must push the metadata using ORAS like:
+
+```bash
+oras push --config <path_to_empty_file>:application/vnd.microsoft.akri-connector.v1+json <container_registry>/<connector_name>:<connector_version>-metadata <connector_metadata_file>
+```
+
+where: 
+ - <path_to_empty_file> can be any file ("/dev/null" is a good choice for linux) as the contents won't be checked 
+ - The connector metadata file is a JSON file that adheres to the schema defined [here](/doc/akri_connector/connector-metadata-schema.json) such as the examples in this folder.
+
+
+for example:
+
+```bash
+oras push --config /dev/null:application/vnd.microsoft.akri-connector.v1+json someAcr.azurecr.io/akri-connectors/minimal-example-connector:1.0.0-metadata ./minimal-example-connector-metadata.json
+```
+
+See [this doc](https://oras.land/docs/commands/oras_push/) for more options/details when using ORAS to push.