Bump version to 0.6.0 and document Playwright web accessor

[Copilot]

Release prep for v0.6.0 which introduces the Playwright web accessor for JavaScript-rendered page support.

Changes

• Version: Bump from 0.5.2 to 0.6.0 in version.json
• Release notes: Add releaseNotes/v0.6.0.md documenting the new NetInteractor.Playwright package
• README: Document Playwright integration including installation and usage

Usage

// For JavaScript-rendered pages, use PlaywrightWebAccessor
await using var webAccessor = new PlaywrightWebAccessor();
var executor = new InterationExecutor(webAccessor);
var result = await executor.ExecuteAsync(config, inputs);

dotnet add package NetInteractor.Playwright

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