Add VSCode configuration for debugging purposes (#886)

.vscode/extensions.json

@@ -0,0 +1,8 @@
+{
+	// See https://go.microsoft.com/fwlink/?LinkId=827846
+	// for the documentation about the extensions.json format
+	"recommendations": [
+		"dbaeumer.vscode-eslint",
+		"msjsdiag.debugger-for-chrome"
+	]
+}