docs: Post 0 mit Grundsätzen der Community

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/community-posts.md

@@ -7,6 +7,8 @@ December 1.“), Post 3 erst am 1. Dezember zusammen mit der Installation der Ap
 
 ## 0 – Willkommen (Textpost, anheften)
 
+Beantwortet auch Reddits Vorschlag für den ersten Post („Explain why r/Ninelands is different … principles …“).
+
 Titel: `Hey there! Welcome to r/Ninelands`
 
 ```text
@@ -29,6 +31,27 @@ How it works, in short:
 
 **The first daily map goes live on December 1.** Until then, have a look at "How to play" and pick your faction.
 
+**What makes this place different**
+
+Every day there is exactly one map, and everyone plays the same one. There's no luck of the draw: if someone scored
+more gold than you, they found something you didn't. That makes the comments the best part. Every daily post is a
+small shared puzzle, and the thread underneath is where we figure it out together.
+
+**A few principles**
+
+- **Friendly and casual.** It's a daily game, not a ladder. New players are welcome, and "how did you get 9/9 lands?"
+  is always a good question.
+- **Share, but let others try first.** Post your result line freely. If you explain exact castle spots or moves, put
+  them in a spoiler tag (>!like this!<) so others can still play the map fresh.
+- **Debate strategy, not people.** Disagreeing about where the castle belongs is half the fun.
+- **One first try.** Only your first game counts. Practice games are for learning, not for a second shot at the
+  leaderboard.
+
+**Build it with me**
+
+This is a new community, and I'd like it to grow with you. Ideas for laws, unlocks, weekly challenges or anything else
+are welcome, and the best ones may well end up in the game.
+
 I'd love to hear what you think: ideas, questions, bugs, anything. Just comment below.
 
 See you on the board!