Fix typos

Add contributions from students of MAI/HSE

added 'are you student' part

Bump nltk from 3.5 to 3.6.6 in /binder

Bumps [nltk](https://github.com/nltk/nltk) from 3.5 to 3.6.6.
- [Release notes](https://github.com/nltk/nltk/releases)
- [Changelog](https://github.com/nltk/nltk/blob/develop/ChangeLog)
- [Commits](https://github.com/nltk/nltk/compare/3.5...3.6.6

)

---
updated-dependencies:
- dependency-name: nltk
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Bump numpy from 1.18.5 to 1.22.0 in /lessons/5-NLP

Bump pillow from 9.1.0 to 9.1.1 in /.devcontainer

Bump nltk from 3.5 to 3.6.6 in /.devcontainer

Bump pillow from 9.1.0 to 9.1.1 in /binder

Updating tracking tags

Added PyTorch Lightning example

Added PyTorch Lightning example

Add RL PyTorch notebook (22-DeepRL/CartPole-RL-PyTorch.ipynb).

Update README.md

Update README.md

Added PyTorch notebook

added new quiz app links

on-behalf-of: @azure opensource@microsoft.com

new quiz links