feat: leboncoin.fr (#2749)

* feat: add leboncoin.fr ad feed

* docs: add leboncoin/ad/:query route

lib/router.js

@@ -1597,6 +1597,9 @@ router.get('/aliyun/database_month', require('./routes/aliyun/database_month'));
 // 礼物说
 router.get('/liwushuo/index', require('./routes/liwushuo/index.js'));
 
+// leboncoin
+router.get('/leboncoin/ad/:query', require('./routes/leboncoin/ad.js'));
+
 // DHL
 router.get('/dhl/:id', require('./routes/dhl/shipment-tracking'));