Added mocha test information to README.md

Author: DCRichards

packages/hw-app-ada/README.md

@@ -7,3 +7,33 @@ Library for Ledger Hardware Wallets.
 [Github](https://github.com/LedgerHQ/ledgerjs/),
 [API Doc](http://ledgerhq.github.io/ledgerjs/),
 [Ledger Devs Slack](https://ledger-dev.slack.com/)
+
+### Tests
+
+As well as the tests in `@ledgerhq/test`, automated end-to-end tests are provided here using [mocha](https://mochajs.org/).
+
+#### Core Tests
+
+Core tests are provided for testing the base functionality of the device.
+
+First, ensure you have a **test** build installed on the device (see ledger app respository for details). Then run:
+
+```shell
+yarn run core-test
+```
+
+#### API Tests
+
+These test the production API and can be run either on a production build or headlessly for fully-automated testing.
+
+For tests which require user interaction, ensure you have a standard production build of the app and run:
+
+```shell
+yarn run api-test
+```
+
+For headless tests, ensure you have a **headless** build installed on the device (see ledger app respository for details). Then run:
+
+```shell
+yarn run api-test --headless
+```