add vscode backend debugger

.vscode/launch.json

@@ -0,0 +1,16 @@
+{
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "type": "java",
+            "name": "Launch Spring Boot App (local profile)",
+            "request": "launch",
+            "cwd": "${workspaceFolder}/backend",
+            "mainClass": "com.example.todoapp.TodoApplication",
+            "projectName": "todo-app",
+            "args": "",
+            "envFile": "${workspaceFolder}/backend/.env",
+            "vmArgs": "-Dspring.profiles.active=local"
+        }
+    ]
+}