Add tutorials with example from top integrations #68

• AWS, Azure, GCP
• Umbrella, Archera, Flexera
• BigQuery, SnowFlaker, Databricks, AWS Athena

Cf. User feedback:

- Documentation Issues:

- Lacks detailed examples and end-to-end tutorials.

- Missing documentation for some searchable actions.

- API integration instructions need more detail (especially for Umbrella).