JS: Add basic storage module API

applications/system/js_app/examples/apps/Scripts/storage.js

@@ -0,0 +1,23 @@
+let storage = require("storage");
+let path = "/ext/storage.test";
+
+print("File exists:", storage.exists(path));
+
+print("Writing...");
+storage.write(path, "Hello World!");
+
+print("File exists:", storage.exists(path));
+
+print("Reading...");
+let data = storage.read(path);
+print(data);
+
+print("Removing...")
+storage.remove(path);
+
+print("Done")
+
+// There's also:
+// storage.virtualInit(path);
+// storage.virtualMount();
+// storage.virtualQuit();