docs: add text on watchlist

src/Entity/Connector.php

@@ -67,6 +67,9 @@ class Connector
     #[ORM\Column]
     private ?\DateTimeImmutable $createdAt = null;
 
+    #[Groups(['connector:list'])]
+    protected int $watchlistCount;
+
     public function __construct()
     {
         $this->id = Uuid::v4();
@@ -155,4 +158,9 @@ class Connector
 
         return $this;
     }
+
+    public function getWatchlistCount(): ?int
+    {
+        return $this->watchLists->count();
+    }
 }