[enh] engines: add about variable

move meta information from comment to the about variable
so the preferences, the documentation can show these information

searx/engines/bing_images.py

@@ -1,15 +1,6 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
 """
  Bing (Images)
-
- @website     https://www.bing.com/images
- @provide-api yes (http://datamarket.azure.com/dataset/bing/search),
-              max. 5000 query/month
-
- @using-api   no (because of query limit)
- @results     HTML (using search portal)
- @stable      no (HTML can change)
- @parse       url, title, img_src
-
 """
 
 from urllib.parse import urlencode
@@ -20,6 +11,16 @@ from searx.utils import match_language
 from searx.engines.bing import language_aliases
 from searx.engines.bing import _fetch_supported_languages, supported_languages_url  # NOQA # pylint: disable=unused-import
 
+# about
+about = {
+    "website": 'https://www.bing.com/images',
+    "wikidata_id": 'Q182496',
+    "official_api_documentation": 'https://www.microsoft.com/en-us/bing/apis/bing-image-search-api',
+    "use_official_api": False,
+    "require_api_key": False,
+    "results": 'HTML',
+}
+
 # engine dependent config
 categories = ['images']
 paging = True