* Add gpt4all-bindings/cli/README.md
* Unify version information
- Was previously split; base one on the other
- Add VERSION_INFO as the "source of truth":
- Modelled after sys.version_info.
- Implemented as a tuple, because it's much easier for (partial)
programmatic comparison.
- Previous API is kept intact.
* Add gpt4all-bindings/cli/developer_notes.md
- A few notes on what's what, especially regarding docs
* Add gpt4all-bindings/python/docs/gpt4all_cli.md
- The CLI user documentation
* Bump CLI version to 0.3.5
* Finalise docs & add to index.md
- Amend where necessary
- Fix typo in gpt4all_cli.md
- Mention and add link to CLI doc in index.md
* Add docstings to gpt4all-bindings/cli/app.py
* Better 'groovy' link & fix typo
- Documentation: point to the Hugging Face model card for 'groovy'
- Correct typo in app.py
