doc: update README.md

README.md

@@ -120,13 +120,16 @@ pnpm playwright test
 
 ### DONE
 
-- upgrade iQuery>3.x
-- upgrade pytorch>2.x
-- e2e playwright tests
-- add an updated online version (HuggingFace)
-- refactor frontend moving from iQuery to gradio
-- play the isolated words in the recordings, to compare the 'ideal' pronunciation with the learner pronunciation (now it's possible on the old frontend, complicated to implement with Gradio - waiting for [this](https://github.com/gradio-app/gradio/issues/9823))
-- added also a Text-to-Speech in-browser (it works only if there are installed the required language packages. In case of failures there is the backend Text-to-Speech feature)
+- Original frontend - upgrade iQuery@3.7.1, [email protected]
+- Upgraded Speech-to-Text German [Silero](https://github.com/snakers4/silero-models) model that blocked the upgrade to PyTorch > 2.x
+- Upgraded PyTorch > 2.x
+- Improved backend tests with the [mutation test suite](https://en.wikipedia.org/wiki/Mutation_testing) [Cosmic Ray](https://cosmic-ray.readthedocs.io)
+- E2E [playwright](https://playwright.dev) tests
+- Added a new frontend based on [Gradio](https://gradio.app)
+- add an updated online version ([HuggingFace Space](https://huggingface.co/spaces/aletrn/ai-pronunciation-trainer))
+- Only on the Gradio frontend version - it's possible to insert custom sentences to read and evaluate
+- Gradio frontend version - play the isolated words in the recordings, to compare the 'ideal' pronunciation with the learner pronunciation
+- Gradio frontend version - re-added the Text-to-Speech in-browser (it works only if there are installed the required language packages. In case of failures there is the backend Text-to-Speech feature)
 
 ### TODO