Update README.md (#25)

* Update README.md

* Add link to contributing.md

Author: rachel-fenichel

README.md

@@ -4,12 +4,12 @@ This plugin for Blockly enables keyboard navigation. It is intended to
 experiment with different actions that might help visually impaired and motor
 impaired people navigate a Blockly workspace.
 
+You can explore the current state of the plugin on the [test page](https://google.github.io/blockly-keyboard-experimentation/).
+
 There is also an [existing keyboard navigation plugin](https://www.npmjs.com/package/@blockly/keyboard-navigation). That plugin may be where
 a finalized version of keyboard navigation eventually lives. But for now, this
 is where experimentation will be done.
 
 ## Contributing
 
-To learn more about contributing to this project, see the contributing page.
-
-TODO: Add a link once this repo is actually moved to its final location.
+To learn more about contributing to this project, see the [contributing page](https://github.com/google/blockly-keyboard-experimentation/blob/main/CONTRIBUTING.md).