Added icons

icons/icon.svg

@@ -0,0 +1,19 @@
+<svg width="48" height="48" viewBox="0 0 96 96">
+  <defs>
+    <style>
+      .cls-1 {
+        fill: #1da64a;
+      }
+
+      .cls-1, .cls-2 {
+        fill-rule: evenodd;
+      }
+
+      .cls-2 {
+        fill: #fff;
+      }
+    </style>
+  </defs>
+  <path id="lock" class="cls-1" d="M81.059,47.926H34.489V28.566A13.521,13.521,0,1,1,61.53,28.4v3a4.5,4.5,0,0,0,4.507,4.507h6.009A4.5,4.5,0,0,0,76.553,31.4v-3a28.544,28.544,0,1,0-57.087.282V47.926H14.959A9.016,9.016,0,0,0,5.945,56.94V86.986A9.016,9.016,0,0,0,14.959,96h66.1a9.016,9.016,0,0,0,9.014-9.014V56.94A9.016,9.016,0,0,0,81.059,47.926Z"/>
+  <path id="plus" data-name="+" class="cls-2" d="M64.925,67.523h-11.6V56.2H42.75V67.523H31.08V77.546H42.75V88.873H53.323V77.546h11.6V67.523Z"/>
+</svg>

manifest.json

@@ -7,7 +7,11 @@
     "description": "Read articles locked behind paywalls of over 40 german newspapers, e.g. Westdeutsche Allgemeine Zeitung, Kölner Stadt-Anzeiger, Hamburger Abendblatt & Leipziger Volkszeitung. ",
   
     "icons": {
-
+      "32": "icons/icon-32.png",
+      "48": "icons/icon-48.png",
+      "64": "icons/icon-64.png",
+      "96": "icons/icon-96.png",
+      "128": "icons/icon-128.png"
     },
   
     "content_scripts": [