first commit. application working

backend/src/main/java/com/weighttracker/controller/UserController.java

@@ -0,0 +1,50 @@
+package com.weighttracker.controller;
+
+import com.weighttracker.model.User;
+import com.weighttracker.service.UserService;
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.web.bind.annotation.*;
+
+@Controller
+@RequestMapping("/usuarios")
+public class UserController {
+
+    private final UserService service;
+
+    public UserController(UserService service) {
+        this.service = service;
+    }
+
+    @GetMapping
+    public String list(Model m) {
+        m.addAttribute("usuarios", service.findAll());
+        return "usuarios";
+    }
+
+    @GetMapping("/nuevo")
+    public String nuevo(Model m) {
+        m.addAttribute("usuario", new User());
+        return "usuario-form";
+    }
+
+    @PostMapping("/guardar")
+    public String guardar(@ModelAttribute("usuario") User u) {
+        service.save(u);
+        return "redirect:/usuarios";
+    }
+
+    @GetMapping("/{id}/editar")
+    public String editar(@PathVariable Long id, Model model) {
+        User user = service.findById(id);
+        model.addAttribute("usuario", user);
+        return "usuario-form";
+    }
+
+    @PostMapping("/{id}/eliminar")
+    public String eliminar(@PathVariable Long id) {
+        service.deleteById(id);
+        return "redirect:/usuarios";
+    }
+
+}