#1 set up category router

backend/src/routes/category.ts

+import express, {Request, Response} from 'express';
+import {model, Schema, HydratedDocument, Types} from 'mongoose';
+
+const router = express.Router();
+
+interface ICategory {
+	name: string;
+	description: string;
+}
+
+const Category = model<ICategory>(
+	'Category',
+	new Schema({
+		name: {
+			type: String,
+			required: true,
+		},
+		description: {
+			type: String,
+			required: false,
+		},
+	})
+);
+
+router.get('/', async (req: Request, res: Response) => {});
+
+router.post('/', async (req: Request, res: Response) => {});
+
+export {router as categoryRouter};

backend/src/types/environment.d.ts

+declare global {
+	namespace NodeJS {
+		interface ProcessEnv {
+			PORT: string;
+			MONGO_URL: string;
+		}
+	}
+}
+
+export {};