Adds dev server vscode launcher.

.vscode/launch.json

@@ -0,0 +1,17 @@
+{
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "Hugo Server",
+            "type": "node-terminal",
+            "request": "launch",
+            "command": "hugo server -D",
+            "cwd": "${workspaceFolder}",
+            "serverReadyAction": {
+                "pattern": "Web Server is available at //localhost:(\\d+)",
+                "uriFormat": "http://localhost:%s",
+                "action": "openExternally"
+            }
+        }
+    ]
+}