docs(readme): clarify install for v2 vs v3 alpha

[leaanthony]

Summary

Adds a small two-row table under "Getting Started" so readers can see at a glance which version of Wails they want — v2 stable, or v3 alpha — and copy the appropriate go install line.

Everything else (badges, sponsors image, JetBrains, FAQ, contributors, license, inspiration) is unchanged.

Test plan

• Render the README on github.com/wailsapp/wails and confirm the table looks right.
• Confirm the sponsors image still renders.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Documentation
  • Updated "Getting Started" section with version information, installation commands, and documentation links for Wails v2 and v3 in a clear table format.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: f730bf20-2469-4933-be4b-07a4ed7030b8

📥 Commits

Reviewing files that changed from the base of the PR and between bea26e8 and c99e43d.

📒 Files selected for processing (1)

• README.md

📝 Walkthrough

Walkthrough

README.md updated to replace a single external-link Getting Started instruction with a comprehensive two-version overview. A table now displays Wails v2 and v3 installation details, status, and documentation links, with a retained link to full installation instructions.

Changes

Cohort / File(s)	Summary
Documentation README.md	"Getting Started" section restructured from single external link to version/status/install command/docs table covering Wails v2 and v3.

Suggested labels

Documentation, v3-alpha, size:XS

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 A table now blooms where one link once stood,
Two Wails versions shine, as they should,
v2 and v3 in rows align,
Making installation clear and fine! ✨

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description provides a clear summary of changes and test plan, but does not follow the required template with sections like Type of change, Testing details, or required checklists.	Fill out the PR template including Type of change, How Has This Been Tested, Test Configuration, and complete the checklist items to align with repository standards.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: adding clarification for installation between Wails v2 and v3 alpha in the README.
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.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/readme-v2-v3

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[Copilot]

Pull request overview

Adds quick-install guidance in the root README so new users can choose between Wails v2 (stable) and v3 (alpha) at a glance.

Changes:

• Introduces a small table under “Getting Started” listing v2 vs v3 status, install command, and docs link
• Replaces the single installation-link sentence with the table + a follow-up link to full installation instructions

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[Copilot]

The v3 install command points to github.com/wailsapp/wails/v3/cmd/wails3@latest, but this repository doesn’t contain a v3/cmd tree (currently v3/ only has scripts). As written, go install will fail for readers. Please update the v3 row to use the actual install path/version for the v3 CLI (as published), or replace the install cell with a link to the v3 installation docs instead of an unverified go install command.

Suggested change

	| v3 | Alpha | `go install github.com/wailsapp/wails/v3/cmd/wails3@latest` | [v3.wails.io](https://v3.wails.io/) |
	| v3 | Alpha | [See v3 installation docs](https://v3.wails.io/getting-started/installation/) | [v3.wails.io](https://v3.wails.io/) |