Add Meilisearch engine

Website: https://www.meilisearch.com/

searx/settings.yml

@@ -700,6 +700,13 @@ engines:
       require_api_key: false
       results: HTML
 
+#  - name : meilisearch
+#    engine : meilisearch
+#    shortcut: mes
+#    enable_http: True
+#    base_url : http://localhost:7700
+#    index : my-index
+
   - name : microsoft academic
     engine : microsoft_academic
     categories : science