Add links table to README

[ojongerius]

Summary

• Adds a quick-reference links table to the top of README.md (after badges, before "What is this?")
• Includes: project site & docs, per-SDK API references, blog post, npm, and PyPI links
• Package names verified from sdk/ts/package.json and sdk/py/pyproject.toml

Test plan

• Verify table renders correctly on GitHub
• Confirm all links resolve

[Copilot]

Pull request overview

Adds a quick-reference links table near the top of the repository README to make key project resources easier to discover.

Changes:

• Inserted a links table (project site/docs, SDK API references, blog post, npm, PyPI) between the header/badges and the “What is this?” section.

[Copilot]

The npm package name linked here ("@agnt-rcpt/sdk-ts") conflicts with the TypeScript quick-start section below, which currently instructs npm install @agent-receipts/sdk-ts and imports from @agent-receipts/sdk-ts. Please align the README to a single published package name (link + install/import examples) so users don’t copy an incorrect command.

[Copilot]

This table uses an empty header row (| | |), which reduces clarity and can be less accessible for screen readers that rely on column headers. Consider adding descriptive headers (e.g., "Resource" / "Link") or switching to a simple bullet list if headers aren’t desired.

Suggested change

	| | |
	| Resource | Link |