Initialize GovOPlaN meta repository

docker/README.md

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+# GovOPlaN Docker
+
+Whole-product Docker composition belongs in this meta repository.
+
+Current shared profiles:
+
+- `govoplan/dev/postgres`
+- `govoplan/dev/production-like`
+
+Module-specific Docker test beds remain in their owning repositories:
+
+- `govoplan-campaign/dev/mail-testbed`
+- `govoplan-files/dev/connectors`
+
+Website-specific serving profiles remain with the public website repository:
+
+- `addideas-govoplan-website/docker-compose.yml`