Support manifest-plus

https://foundryvtt.wiki/en/development/manifest-plus

system.json

@@ -338,5 +338,23 @@
   "gridDistance": 1,
   "gridUnits": "m",
   "primaryTokenAttribute": "sante.vie",
-  "secondaryTokenAttribute": "sante.endurance"
+  "secondaryTokenAttribute": "sante.endurance",
+  "manifestPlusVersion": "1.2.0",
+  "media": [
+    {
+      "type": "icon",
+      "url": "systems/foundryvtt-reve-de-dragon/styles/img/reve-de-dragon-icon.webp",
+      "caption": "Logo Rêve de Dragon"
+    },
+    {
+      "type": "cover",
+      "url": "systems/foundryvtt-reve-de-dragon/styles/img/reve-de-dragon-cover.webp",
+      "caption": "Logo Rêve de Dragon"
+    },
+    {
+      "type": "screenshot",
+      "url": "http://www.lahiette.com/leratierbretonnien/wp-content/uploads/2020/11/Screenshot_20201128_181102.webp",
+      "caption": "Capture d'écran de Rêve de Dragon sur Foundry"
+    }
+  ]
 }