docs: update README installation steps

[Rezisn]

Summary

• Clarify xcbeautify as a required dependency for building devicekit-ios.
• Ensure git submodules are initialized during setup (required for Opus).
• Updated Quick Start step to include parameters for device.screenshot.

[coderabbitai]

Walkthrough

The README documentation has been updated in two areas. The "Building from Source" section now includes explicit instructions to install the xcbeautify dependency via Homebrew. In the "Quick Start" section, the example JSON-RPC request for device.screenshot was modified to pass format: "png" as a parameter instead of using an empty parameters object.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description check	✅ Passed	The description is related to the changeset and mentions the three areas of change, though the actual implementation details may not fully match all stated objectives.
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.
Title check	✅ Passed	The PR title 'docs: update README installation steps' directly addresses the main changes documented in the raw summary and PR objectives, which focus on updating README documentation including installation dependencies and Quick Start examples.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@README.md`:
- Around line 83-86: The description for the device.screenshot example is
inconsistent: the JSON-RPC call sets "format": "jpg" but the text says it
returns a PNG; update the README so they match by either changing the params in
the example (the JSON string for method "device.screenshot" and params "format")
to "png" or change the descriptive sentence to state it returns a base64-encoded
JPEG; ensure references to "device.screenshot" and the "format" param are
updated accordingly.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: b096ac97-f8d4-41ce-a068-45e5ba36bbc0

📥 Commits

Reviewing files that changed from the base of the PR and between 9562f3a and b5cf1ef.

📒 Files selected for processing (1)

• README.md

[Rezisn]

found that current implementation of device.screenshot (here) set format as mandatory parameters.

[gmegidish]

Thank you!

[gmegidish]

@Rezisn I cannot merge unless you sign your commits. Can you do that please?

[Rezisn]

@gmegidish i rewrote the commits to have the signed version, thanks