[feat]: engines: add astrophysical data system

searx/settings.yml

@@ -380,6 +380,14 @@ engines:
       require_api_key: false
       results: JSON
 
+  # - name: astrophysics data system
+  #   engine: astrophysics_data_system
+  #   sort: asc
+  #   weight: 5
+  #   categories: [science]
+  #   api_key: your-new-key
+  #   shortcut: ads
+
   - name: alpine linux packages
     engine: alpinelinux
     disabled: true