PWA: manifest.json, Service Worker, Meta-Tags und README-Hinweis hinzugefügt

static/manifest.json

@@ -0,0 +1,14 @@
+{
+  "name": "Elpatrons Datumsrechner",
+  "short_name": "Datumsrechner",
+  "start_url": "/",
+  "display": "standalone",
+  "background_color": "#2563eb",
+  "theme_color": "#2563eb",
+  "description": "Open Source Web-App für Kalender- und Datumsberechnungen.",
+  "icons": [
+    { "src": "/favicon.png", "sizes": "32x32", "type": "image/png" },
+    { "src": "/favicon.ico", "sizes": "48x48 64x64 128x128 256x256", "type": "image/x-icon" },
+    { "src": "/logo.svg", "sizes": "any", "type": "image/svg+xml" }
+  ]
+} 

static/service-worker.js

@@ -0,0 +1,20 @@
+const CACHE_NAME = 'datumsrechner-cache-v1';
+const urlsToCache = [
+  '/',
+  '/static/style.css',
+  '/favicon.ico',
+  '/favicon.png',
+  '/logo.svg',
+];
+self.addEventListener('install', event => {
+  event.waitUntil(
+    caches.open(CACHE_NAME)
+      .then(cache => cache.addAll(urlsToCache))
+  );
+});
+self.addEventListener('fetch', event => {
+  event.respondWith(
+    caches.match(event.request)
+      .then(response => response || fetch(event.request))
+  );
+});