Fix db relations, add sample data, show categories in frontend menu

software/backend/routes/category.routes.ts

@@ -0,0 +1,22 @@
+import { Router, Request, Response, NextFunction } from "express";
+import { Category } from "../models/category.model";
+
+export const category = Router()
+
+category.get("/", (req: Request, res: Response, next: NextFunction) => {
+  Category.findAll()
+    .then(categories => {
+      res.json(categories)
+    })
+    .catch(next)
+})
+
+category.post("/", (req: Request, res: Response, next: NextFunction) => {
+  try {
+    console.log(req.body)
+    const category = Category.create(req.body)
+    res.status(201).json(category)
+  } catch (e) {
+    next(e)
+  }
+})