diff --git a/README.md b/README.md
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+# mapy-mg
+
+Web-App für Foto-Uploads, EXIF-Positionen und Kartenanzeige.
+
+## Zielbild
+
+- Fotos per Webinterface hochladen
+- GPS-Daten aus EXIF lesen
+- Bilder als Marker auf OpenStreetMap anzeigen
+- zeitbasierte Route grob verbinden
+- Bilder beim Marker-Klick im Vollbild anzeigen
+
+## Struktur
+
+- `src/index.ts` Einstiegspunkt
+- `src/server/` HTTP-Schicht
+- `src/shared/` gemeinsame Hilfsfunktionen
+- `src/domain/` fachliche Modelle
+- `src/features/` Anwendungslogik nach Bereichen
+
diff --git a/src/domain/photo.ts b/src/domain/photo.ts
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+++ b/src/domain/photo.ts
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+export interface Photo {
+  id: string;
+  fileName: string;
+  capturedAt: string | null;
+  latitude: number | null;
+  longitude: number | null;
+  thumbnailUrl: string | null;
+}
+
diff --git a/src/domain/route.ts b/src/domain/route.ts
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+export interface RoutePoint {
+  photoId: string;
+  capturedAt: string;
+  latitude: number;
+  longitude: number;
+}
+
diff --git a/src/features/map/map-service.ts b/src/features/map/map-service.ts
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+++ b/src/features/map/map-service.ts
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+import type { RoutePoint } from "../../domain/route.js";
+
+export function buildRoute(points: RoutePoint[]): RoutePoint[] {
+  return points.slice().sort((a, b) => a.capturedAt.localeCompare(b.capturedAt));
+}
+
diff --git a/src/features/photos/photo-service.ts b/src/features/photos/photo-service.ts
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+++ b/src/features/photos/photo-service.ts
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+import type { Photo } from "../../domain/photo.js";
+
+export function listPhotos(): Photo[] {
+  return [];
+}
+