Added EntityFinder#find as concept example

src/main/java/net/minestom/server/utils/entity/EntityFinder.java

@@ -1,8 +1,11 @@
 package net.minestom.server.utils.entity;
 
+import net.minestom.server.entity.Entity;
 import net.minestom.server.entity.EntityType;
 import net.minestom.server.utils.math.IntRange;
 
+import java.util.ArrayList;
+
 /**
  * Represent a query which can be call to find one or multiple entities
  * It is based on the target selectors used in commands
@@ -42,6 +45,15 @@ public class EntityFinder {
         this.onlyPlayers = onlyPlayers;
     }
 
+    /**
+     * Find a list of entities (could be empty) based on the conditions
+     *
+     * @return all entities validating the conditions
+     */
+    public ArrayList<Entity> find() {
+        return new ArrayList<>();
+    }
+
     public enum EntitySort {
         ARBITRARY, FURTHEST, NEAREST, RANDOM
     }