Add standalone FAQ markdown

FAQ.md

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+# FAQ & Tips
+
+Expand a section for common player questions and edge cases.
+
+## Getting started
+- **How do I join?** Register with a username, password, and display name. Then log in with the same credentials.
+- **What is the admin key?** If your host shares the admin key, enter it during registration to unlock admin controls.
+- **Why do I need a display name?** Suggestions and votes show who submitted them. You need a display name before you can add games or scores.
+
+## Suggest phase
+- **How many games can I add?** Up to 5 suggestions per player in Suggest. Each joker granted in Vote lets you add one more; every joker is consumed when you use it.
+- **Can I edit or delete suggestions later?** Game names lock after leaving Suggest. Optional fields stay editable; admins can edit or delete any time.
+- **Any rules for links and images?** Use http(s) links. Screenshots must end with an image file (png, jpg, gif, webp, avif). Invalid links are rejected.
+- **Why was my suggestion rejected?** You can only add games in Suggest or with a joker in Vote. Provide a display name, stay within the 5 + joker limit, use http(s) links to reachable media, and keep player counts between 1 and 32 with min ≤ max.
+
+## Vote phase
+- **How do votes work?** Move the 0–10 slider for each game. Scores save instantly; you can adjust until you finalize.
+- **What does finalize do?** Finalize locks your votes while you're in Vote. You must score every game first. Toggle it off in the same phase to make changes.
+- **Why can't I vote?** Voting only works in the Vote phase when you're logged in and have a display name. If you skipped the display name, re-register; admins cannot add one for you.
+- **I finalized but thought of a great game. Can I still add it?** Ask an admin for a joker during Vote. It gives you one extra slot, consumes the joker, and unfinalizes everyone so the new game can be scored.
+- **What are linked games?** Admins can link duplicates during Vote. Linked games share scores. Linking or unlinking clears votes for that group and reopens affected players to rescore.
+- **A new game appeared after I finalized. What now?** New games (from jokers) or link changes remove finalization. Check your list and score every game again before finalizing.
+- **What scores are allowed?** Scores must be whole numbers from 0 to 10. Anything outside that range is rejected.
+
+## Results phase
+- **Why can't I see results?** Results stay hidden until an admin opens them. You move to Results automatically when unlocked.
+- **What do results show?** A leaderboard with averages, vote counts, your own score, and any links or media for each game.
+- **Can I edit games or votes in Results?** No. Suggestions and votes are locked in Results. Changes require moving back to Vote (for example if an admin closes results or resets).