Added example images for poster box

assets/themes/advertising/advertising.json

@@ -975,8 +975,8 @@
             "en": "a poster box"
           },
           "exampleImages":[
-            "",
-            "",
+            "./assets/themes/advertising/Screen_poster_box.jpg",
+            "./assets/themes/advertising/Mupi_Alcoi.jpg",
             ""
           ]
         },

assets/themes/advertising/license_info.json

@@ -49,6 +49,16 @@
       "https://archive.org/details/northfleet-2021-05-30/PXL_20210530_175057096.jpg"
     ]
   },
+  {
+    "path": "Mupi_Alcoi.jpg",
+    "license": "CC-BY 4.0",
+    "authors": [
+      "Paunofu"
+    ],
+    "sources": [
+      "https://imgur.com/4Q3glWH"
+    ]
+  },
   {
     "path": "Repsol_Billboard.jpg",
     "license": "CC BY 4.0",
@@ -59,6 +69,16 @@
       "https://imgur.com/MwvK0jc"
     ]
   },
+  {
+    "path": "Screen_poster_box.jpg",
+    "license": "CC BY-SA 4.0",
+    "authors": [
+      "T. Segonds"
+    ],
+    "sources": [
+      "https://commons.wikimedia.org/wiki/File:Screen_poster_box.jpg"
+    ]
+  },
   {
     "path": "Small_Board.jpg",
     "license": "CC BY-SA 4.0",