docs: issue guide (#34457)

Author: pavelfeldman

FILING_ISSUES.md

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+# How to File a Bug Report That Actually Gets Resolved
+
+Make sure you’re on the latest Playwright release before filing. Check existing GitHub issues to avoid duplicates.
+
+## Use the Template
+
+Follow the **Bug Report** template. It guides you step-by-step:
+
+- Fill it out thoroughly.
+- Clearly list the steps needed to reproduce the bug.
+- Provide what you expected to see versus what happened in reality.
+- Include system info from `npx envinfo --preset playwright`.
+
+## Keep Your Repro Minimal
+
+We can't parse your entire code base. Reduce it down to the absolute essentials:
+
+- Start a fresh project (`npm init playwright@latest new-project`).
+- Add only the code/DOM needed to show the problem.
+- Only use major frameworks if necessary (React, Angular, static HTTP server, etc.). 
+- Avoid adding extra libraries unless absolutely necessary. Note that we won't install any suspect dependencies.
+
+## Why This Matters
+- Most issues that lack a repro turn out to be misconfigurations or usage errors.
+- We can't fix problems if we can’t reproduce them ourselves.
+- We can’t debug entire private projects or handle sensitive credentials.
+- Each confirmed bug will have a test in our repo, so your repro must be as clean as possible.
+
+## More Help
+
+- [Stack Overflow’s Minimal Reproducible Example Guide](https://stackoverflow.com/help/minimal-reproducible-example)
+- [Playwright Debugging Tools](https://playwright.dev/docs/debug)
+
+## Bottom Line
+A well-isolated bug speeds up verification and resolution. Minimal, public repro or it’s unlikely we can assist.