add files infra docker service for data platform

00-network/README.md

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+# 00-network: Shared Network Setup
+
+## Purpose
+Creates the `shared_data_network` Docker network that all services use to communicate.
+
+## Run
+```bash
+bash create-network.sh
+```
+
+## Verify
+```bash
+docker network ls | grep shared_data_network
+docker network inspect shared_data_network
+```
+
+## Note
+This network must be created before starting any other services.

00-network/create-network.sh

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+#!/bin/bash
+docker network create shared_data_network 2>/dev/null || echo "Network shared_data_network already exists"