docs: Add health check endpoints from PR #11 to README

[Copilot]

PR #11 added /liveness and /readiness endpoints for container orchestration. This documents them in the README.

Changes

• API Reference: Added Health Checks section documenting both endpoints

  • /liveness: Always returns {"status": "alive"} for restart decisions
  • /readiness: Returns 200 or 503 based on database connectivity

• Usage Examples: Added Example 5 with curl commands and Kubernetes probe configuration

livenessProbe:
  httpGet:
    path: /liveness
    port: 8000
  initialDelaySeconds: 30
  periodSeconds: 10

readinessProbe:
  httpGet:
    path: /readiness
    port: 8000
  initialDelaySeconds: 10
  periodSeconds: 5

Original prompt

Update the README.md with the recent changes of #11

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