📝 [#4796] Documenting the rx-mission docker environment

docker/rx-mission/README.md

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+# RX Mission
+
+The `docker-compose.rx-mission.yml` compose file is available to run a mock services intended
+to replicate some Roxit interfaces. Currently only containing a mock product detail endpoint.
+
+The compose file takes some serious creative liberty, and doesn't represent a real Roxit environment.
+At the moment we cannot use a real Roxit products environment,
+so this mock service shall have to do for the development and testing of #4796.
+
+The data returned from `/product/<product_uuid>` is a stripped example provided by Roxit,
+and very loosely depicts real products.
+
+When development of the Roxit products environment is completed, this docker environment must be updated.
+
+## docker compose
+
+Start an instance in your local environment from the parent directory:
+
+```bash
+docker compose -f docker-compose.rx-mission.yml up -d
+```
+
+This starts a flask application at http://localhost:80/product/<product_uuid>.
+To recognized `uuid's` can be found in the `rx-mission/fixtures/rx-mission-products.json` file.
+
+## Load fixtures
+
+The flask app uses the fixtures in `rx-mission/fixtures` as a simple database.