readme on dummy gateway

dummy_gateway/README.md

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+Dummy gateway
+============
+
+Dummy gateway application that receives a GET request at:
+
+`/submit_job/<job_id>`
+
+and creates an output on object store of Jetstream.
+
+The docker container needs to be built locally in order to copy the credentials
+necessary to write to object store.
+
+The purpose of this is to demonstrate how from a Notebook running
+on Jetstream you can interactively submit a job to a gateway with `requests` and
+then get the results from object store