Create configuration.md

docs/configuration.md

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+# Configuration
+
+OpenRAG uses environment variables for configuration. Copy `.env.example` to `.env` and populate with your values:
+
+```bash
+cp .env.example .env
+```
+
+## Required Variables
+
+| Variable | Description |
+|----------|-------------|
+| `OPENAI_API_KEY` | Your OpenAI API key |
+| `OPENSEARCH_PASSWORD` | Password for OpenSearch admin user |
+| `LANGFLOW_SUPERUSER` | Langflow admin username |
+| `LANGFLOW_SUPERUSER_PASSWORD` | Langflow admin password |
+| `LANGFLOW_CHAT_FLOW_ID` | ID of your Langflow chat flow |
+| `LANGFLOW_INGEST_FLOW_ID` | ID of your Langflow ingestion flow |
+| `NUDGES_FLOW_ID` | ID of your Langflow nudges/suggestions flow |
+
+## Ingestion Configuration
+
+| Variable | Description |
+|----------|-------------|
+| `DISABLE_INGEST_WITH_LANGFLOW` | Disable Langflow ingestion pipeline (default: `false`) |
+
+- `false` or unset: Uses Langflow pipeline (upload → ingest → delete)
+- `true`: Uses traditional OpenRAG processor for document ingestion
+
+## Optional Variables
+
+| Variable | Description |
+|----------|-------------|
+| `LANGFLOW_PUBLIC_URL` | Public URL for Langflow (default: `http://localhost:7860`) |
+| `GOOGLE_OAUTH_CLIENT_ID` / `GOOGLE_OAUTH_CLIENT_SECRET` | Google OAuth authentication |
+| `MICROSOFT_GRAPH_OAUTH_CLIENT_ID` / `MICROSOFT_GRAPH_OAUTH_CLIENT_SECRET` | Microsoft OAuth |
+| `WEBHOOK_BASE_URL` | Base URL for webhook endpoints |
+| `AWS_ACCESS_KEY_ID` / `AWS_SECRET_ACCESS_KEY` | AWS integrations |
+| `SESSION_SECRET` | Session management (default: auto-generated, change in production) |
+| `LANGFLOW_KEY` | Explicit Langflow API key (auto-generated if not provided) |
+| `LANGFLOW_SECRET_KEY` | Secret key for Langflow internal operations |
+
+See `.env.example` for a complete list with descriptions, and `docker-compose*.yml` for runtime usage.