Add app-testing skill

[MrTalhaMTS]

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[MrTalhaMTS]

app-testing is a focused Codex skill for serious app QA. Instead of jumping into random checks, it creates a tailored testing checklist first, then runs a deep, methodical validation pass across critical flows, edge cases, permissions, integrations, and broader quality signals. The result is faster coverage, clearer bug reports, and far less shallow testing.

Built for web apps, mobile apps, desktop apps, internal tools, and API-backed products, app-testing helps Codex behave more like an experienced QA engineer than a generic assistant. It prioritizes the highest-risk user journeys, expands intelligently when failures appear, and produces structured findings with severity, reproduction steps, expected vs actual behavior, and remaining risk.

In short: app-testing turns vague requests like “test this app” into a repeatable, checklist-driven QA workflow that improves confidence before release.