Bump to v0.6.0 with Playwright docs and release notes

[Copilot]

The release needs version 0.6.0, a fresh changelog entry, and README coverage for the new Playwright web accessor.

• Versioning: Updated version.json to 0.6.0.
• Release Notes: Added releaseNotes/v0.6.0.md summarizing recent improvements, fixes, and dependency notes.
• Documentation: Extended README with Playwright web accessor usage alongside existing web accessor guidance.

using NetInteractor;
using NetInteractor.Config;
using NetInteractor.WebAccessors;

var config = ConfigFactory.DeserializeXml<InteractConfig>("Scripts/Sample.config");

// Playwright-based executor (headless by default)
await using var executor = new InterationExecutor(new PlaywrightWebAccessor());
var result = await executor.ExecuteAsync(config);

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