chore(debug): add .vscode launch.json configuration for debugging

.vscode/launch.json

@@ -0,0 +1,13 @@
+{
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "name": "Launch",
+      "type": "go",
+      "request": "launch",
+      "mode": "debug",
+      "program": "${workspaceFolder}/main.go",
+      "args": ["-dev", "-port", "8080"]
+    }
+  ]
+}