add test app launch config

.gitignore

@@ -17,5 +17,6 @@
 .todo
 .idea/
 .vscode/
+!test/app/.vscode/
 
 bin/

test/app/.vscode/launch.json

@@ -0,0 +1,20 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "Connect to server",
+            "type": "go",
+            "debugAdapter": "dlv-dap", // `legacy` by default
+            "request": "attach",
+            "mode": "remote",
+            "port": 2345,
+            "host": "127.0.0.1",
+            "substitutePath": [
+              { "from": "${workspaceFolder}/test/app", "to": "/" },
+            ]
+        },
+    ]
+}