Upgrade Provider - Create/Update provider design, readme, contributing and support docs

[kmoe]

Maintenance of the standard library providers prioritises stability and correctness relative to the provider's intended feature set. Create a design document describing this feature set, and any other design considerations which influence the architecture of the provider and what can and cannot be added to it.

As part of the utility provider upgrade guidance in the form of CONTRIBUTING.md, DESIGN.md, README.mdandSUPPORT.md` either needs to be added or updated. There are examples in the tls provider:

• CONTRIBUTING.md
• DESIGN.md
• README.md
• SUPPORT.md

[SBGoods]

In order to keep the scope of this issue relatively small, I've created a separate issue for creating the design doc. See #113.

[github-actions]

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