working version checkin

*  add config class
*  add vlookup
*  add menu
*  add photo folder creation
*  add prep for product templates

src/config.ts

@@ -0,0 +1,10 @@
+class Config {
+  productPhotosFolderId: string
+
+  constructor() {
+    let ss = SpreadsheetApp.getActive()
+    let s = ss.getSheetByName("vars")
+
+    this.productPhotosFolderId = vlookupByColumns("vars", "key", "productPhotosFolderId", "value")
+  }
+}