added whole system from ola4doc

sys/node_modules/postcss/d.ts/vendor.d.ts

@@ -0,0 +1,14 @@
+/**
+ * Contains helpers for working with vendor prefixes.
+ */
+declare module Vendor {
+    /**
+     * @returns The vendor prefix extracted from the input string.
+     */
+    function prefix(prop: string): string;
+    /**
+     * @returns The input string stripped of its vendor prefix.
+     */
+    function unprefixed(prop: string): string;
+}
+export default Vendor;