added docker for deployment and README for how to

.dockerignore

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+.git/
+.idea/
+.vs/
+.vscode/
+
+**/bin/
+**/obj/
+**/TestResults/
+**/coverage/
+
+*.user
+*.suo
+*.log
+
+.env
+.env.*
+
+Dockerfile
+docker-compose.yml
+README.md

Dockerfile

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+FROM mcr.microsoft.com/dotnet/sdk:10.0 AS build
+WORKDIR /src
+
+COPY Guestlist.sln ./
+COPY Guestlist/Guestlist.csproj Guestlist/
+RUN dotnet restore Guestlist.sln
+
+COPY Guestlist/ Guestlist/
+RUN dotnet publish Guestlist/Guestlist.csproj \
+    --configuration Release \
+    --no-restore \
+    --output /app/publish
+
+FROM mcr.microsoft.com/dotnet/aspnet:10.0 AS runtime
+WORKDIR /app
+
+ENV ASPNETCORE_URLS=http://+:8080
+EXPOSE 8080
+
+COPY --from=build /app/publish ./
+
+ENTRYPOINT ["dotnet", "Guestlist.dll"]

README.md

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+# Guestlist
+
+Minimale Guestlist-App mit Admin/Maintainer-Login, Guest-Access-Code und MongoDB.
+
+## Schnellstart mit Docker Compose
+
+```bash
+docker compose up -d --build
+```
+
+App öffnen:
+
+```text
+http://localhost:8080
+```
+
+Beim ersten Start:
+
+```text
+http://localhost:8080/setup
+```
+
+Dort den ersten Admin und den Guest Access Code anlegen.
+
+## Nützliche Befehle
+
+Logs anzeigen:
+
+```bash
+docker compose logs -f app
+```
+
+Stoppen:
+
+```bash
+docker compose down
+```
+
+Stoppen und MongoDB-Daten löschen:
+
+```bash
+docker compose down -v
+```
+
+## Konfiguration
+
+Die App wird im Container über Environment Variables konfiguriert:
+
+```yaml
+Mongo__ConnectionString: mongodb://mongo:27017
+Mongo__DatabaseName: guestlist
+ASPNETCORE_URLS: http://+:8080
+```
+
+MongoDB-Daten liegen im Compose-Volume `mongo_data`.

docker-compose.yml

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+services:
+  app:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    container_name: guestlist-app
+    restart: unless-stopped
+    ports:
+      - "8080:8080"
+    environment:
+      ASPNETCORE_ENVIRONMENT: Production
+      ASPNETCORE_URLS: http://+:8080
+      Mongo__ConnectionString: mongodb://mongo:27017
+      Mongo__DatabaseName: guestlist
+    depends_on:
+      - mongo
+
+  mongo:
+    image: mongo:7
+    container_name: guestlist-mongo
+    restart: unless-stopped
+    volumes:
+      - mongo_data:/data/db
+    ports:
+      - "27017:27017"
+
+volumes:
+  mongo_data: