Add SLI docs

[lukasz-wal]

No description provided.

[Copilot]

Pull request overview

Adds initial documentation for SLI (Service Level Indicator) collection/exposure in the CDP codebase, plus a root README entry point to that documentation.

Changes:

• Added docs/sli/README.md describing SLI architecture, available SLI types, and an API endpoint for exposure.
• Added a root README.md linking to the SLI documentation.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 5 comments.

File	Description
docs/sli/README.md	New SLI documentation (overview, Mermaid diagram, SLI list, and API example).
README.md	New root documentation index linking to the SLI docs.

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[Copilot]

The endpoint path is missing a leading / (controller is @Controller('storage-providers') and @Get('/average-monthly-sli')), and the curl example appears to have broken quoting (extra trailing ' after the last storageProvidersIds value, and the URL itself isn’t wrapped in quotes). This makes the example non-copy-pastable.

Suggested change

	- Endpoint: `GET storage-providers/average-monthly-sli`
	- Format: `JSON`
	- Example:
	```curl -X 'GET' \
	https://cdp.allocator.tech/storage-providers/average-monthly-sli?storageProvidersIds=f03623017&storageProvidersIds=f03644168' \
	- Endpoint: `GET /storage-providers/average-monthly-sli`
	- Format: `JSON`
	- Example:
	```curl -X 'GET' \
	'https://cdp.allocator.tech/storage-providers/average-monthly-sli?storageProvidersIds=f03623017&storageProvidersIds=f03644168' \

[Copilot]

The root README currently contains a placeholder ... in the Overview section. If this README is intended to be user-facing project documentation, please replace the placeholder with a minimal real overview (or remove the section) so the repo doesn’t ship incomplete docs.

Suggested change

	...
	The Compliance Data Platform (CDP) centralizes and standardizes compliance-related data to support monitoring, reporting, and governance across services. This repository contains the core documentation and supporting materials for working with CDP, including service-level indicators (SLIs) and related implementation guidance.