docs(readme): add badges + pricing CTA to match Python SDK (#1604)

[karlwaldman]

Closes part of #1604 (SDK README optimization — bring Node/Go/PHP READMEs up to Python SDK quality).

What changed

• Added the closing "Why OilPriceAPI?" value-prop / pricing CTA block to the PHP SDK README, mirroring the Python, Node, and Go SDK READMEs:
  • "98% less cost than Bloomberg Terminal" value prop
  • Key Benefits list
  • Start Free / View Pricing / Read Docs CTA row (links to https://oilpriceapi.com/pricing)

Scope / notes

• Docs-only. No source, code examples, or public API changed.
• Badge row and the header pricing link were already present in this README — this PR only adds the missing closing pricing CTA to reach parity with the Python template.
• Node and Go READMEs already contain the full badges + pricing CTA + "Why OilPriceAPI?" section, so no PR was needed for those two.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Documentation
  • Added a new “Why OilPriceAPI?” section to the README with a concise list of key benefits.
  • Included prominent links to get started, view pricing, and read the docs.
  • Added a closing team credit line for a more polished end-user experience.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: fc698f05-ac33-489c-924f-2546244f22fc

📥 Commits

Reviewing files that changed from the base of the PR and between 587e650 and acdb27b.

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

Adds a new "Why OilPriceAPI?" section to README.md, including a "Key Benefits" bullet list, call-to-action links (Start Free, View Pricing, Read Docs), and a closing sign-off line.

Changes

README documentation update

Layer / File(s)	Summary
Add Why OilPriceAPI section README.md	Adds a new "Why OilPriceAPI?" subsection with a Key Benefits bullet list, three call-to-action links, and a closing sign-off line.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Related PRs: None found.

Suggested labels: documentation

Suggested reviewers: None available.

Poem

A rabbit hops through README's page,
Adding benefits line by line, an upgrade for the age,
"Start Free," it whispers, "Pricing's clear to see,"
Docs and links now bloom, as easy as can be. 🐰📄

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title is specific and matches the docs-only README update, especially the new pricing CTA and Python SDK parity.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/php-readme-pricing-cta

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