docs(products): add TODOs for future functionalities

This commit introduces several TODOs for future operations on the 'products' service and controller. These primarily outline desired functionalities such as adding, editing, and deleting a product, and listing all products with pagination.

src/products/products.controller.ts

@@ -1,4 +1,12 @@
 import { Controller } from '@nestjs/common';
 
 @Controller('products')
-export class ProductsController {}
+export class ProductsController {
+  //TODO add a new product (admin)
+
+  //TODO edit a product (admin)
+
+  //TODO delete a product (admin)
+
+  //TODO list all product with pagination.
+}

src/products/products.service.ts

@@ -1,4 +1,13 @@
 import { Injectable } from '@nestjs/common';
 
 @Injectable()
-export class ProductsService {}
+export class ProductsService {
+  //TODO add a new product (admin)
+
+  //TODO edit a product (admin)
+
+  //TODO delete a product (admin)
+
+  //TODO list all product with pagination.
+
+}