Add initial notes on possible runner design for scaling the analysis

runner/README.md

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+# predicTCR Runner
+
+This will be a script or Docker image to do the Python+R analysis.
+
+It needs to
+
+- Regularly poll the predicTCR web service to ask if there is a sample that needs processing
+- If one is available
+  - claim the sample
+  - download the input files
+  - run the analysis
+  - upload the results
+
+Authentification can be done via a long-lived JWT token that admins can request online.
+
+Deployment could be done with a Docker image and a docker-compose config.
+
+Admin would set environment variables to provide
+
+- path to model weights
+- JWT token