agregar función "encontrar por comunidad"

servicio-areas-comunes/src/common_areas/common_areas.service.ts

@@ -34,4 +34,9 @@ export class CommonAreasService {
   async remove(id: string) {
     return this.commonAreaModel.findByIdAndRemove({ _id: id }).exec();
   }
+
+  async findByCommunity(community_id: string): Promise<CommonArea[]> {
+    return this.commonAreaModel.find({ community_id: community_id }).exec();
+  }
+
 }