feat: add SDK docs

[janb87]

Summary by Sourcery

Documentation:

• Document the SettleMint SDK, a toolkit designed to simplify blockchain integration into applications.

[linear]

ENG-2172 Update SDK documentation link and add Table of Contents

jan on https://github.com/settlemint/sdk i think the link to Documentation should point to the page in the docs about the SDK (which i assume then points back to github) and i think we should have a ToC on there as well with the different packages

settlemint/sdk

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request introduces documentation for the SettleMint SDK. It adds a new section to the Development Tools page that links to a dedicated SDK page. The SDK page provides an overview of the SDK, its features, and a link to the SDK GitHub repository.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Added documentation for the SettleMint SDK.	Added a new section to the Development Tools page that introduces the SDK and links to the dedicated SDK page. Created a new SDK page that provides an overview of the SDK, its features (comprehensive integration, modular architecture, developer experience, enterprise readiness, type safety), and a link to the SDK GitHub repository. Included licensing information for the SDK on the SDK page.	docs/using-platform/15_dev-tools/15_dev-tools.md docs/using-platform/15_dev-tools/1_SDK.md

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[sourcery-ai]

Hey @janb87 - I've reviewed your changes - here's some feedback:

Overall Comments:

• The heading level for 'Code studio' was changed from ### to ##. Please ensure heading levels are used consistently throughout the documentation.
• There's an inconsistency in the GitHub repository URLs: 'settlemint-sdk' vs 'sdk'. Please verify and use the correct repository name consistently.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Review instructions: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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