add useful badges to readme, use include in docs index.md

[rafsaf]

Contributor's Note

Please mark the following items with an [x] if they apply to your PR.
Leave the [ ] if they are not applicable, or if you have not completed the item.

• I have added / updated documentation in /docs for any user-facing features or additions.
• I have ran acceptance tests for Debug provider to verify that the change works as expected.
• I have ran acceptance tests for Google Cloud Storage provider to verify that the change works as expected.
• I have ran acceptance tests for Azure Blob Storage provider to verify that the change works as expected.
• I have ran acceptance tests for AWS S3 provider to verify that the change works as expected.