Update README.md

Author: severo

README.md

@@ -5,6 +5,6 @@ This is a monorepo for the Hyperparam project.
 It contains the following package:
 - [`@hyparam/components`](./packages/components): a library of React components for building Hyperparam UIs.
 
-It also contains the following application:
+It also contains the following applications:
 - [`hyperparam`](./apps/cli): a cli tool for viewing arbitrarily large datasets in the browser.
-
+- [`hightable-demo`](./apps/hightable-demo): an example project showing how to use [hightable](https://github.com/hyparam/hightable).