Add FrontRow to Training

[majdukovic]

Hi, would like to add my open source project to the Training section.

FrontRow is an MIT licensed React Native mobile app I built specifically as a QA automation training surface. It's the kind of thing I wish had existed when I was first picking up Maestro and Appium, since every tutorial uses a TODO app and that doesn't really prepare you for the failure modes that ship to real users.

What's in it:

• Cross platform testIDs that work across Maestro, Appium, Espresso and XCUITest from one registry
• A deep QA Debug Menu so trainees can force 4xx and 5xx errors, timeouts, offline mode, denied permissions, declined IAP, expired tokens, and time travel for expiry related testing, all without a backend
• 30 Maestro flows covering auth, browse, buy, billing, and the debug menu itself
• No accounts, no secrets, runs on a simulator in five minutes

Repo: https://github.com/majdukovic/frontrow

Guidelines check:

• Searched the list, no existing entry
• One PR, one suggestion
• Description ends with a period
• No trailing whitespace
• I agree to CC0 for the list contribution per the contributing guidelines

If "Training" feels like the wrong fit, happy to move it. There isn't really a dedicated section for sample apps to practice on, which the contributing guidelines note is something you'd welcome adding, but I didn't want to introduce a whole new category for a single entry.