chore: add README, remove cspell

[VioletsOleander]

cspell is too slow, since nvim has builtin spell check, I'd rather let cspell become an optional opt-in check.

[gemini-code-assist]

Code Review

This pull request removes the cspell spell-checking configuration, including the pre-commit hook in .pre-commit-config.yaml, the cspell.json configuration file, and the project-words.txt dictionary. Additionally, it adds a basic README.md file introducing the project as 'Vanillian'. There are no review comments to evaluate, so no further feedback is provided.

[Copilot]

Pull request overview

Removes the cspell spell-checking integration (config, dictionary, and pre-commit hooks) in favor of relying on nvim's built-in spell check, and adds a minimal README to introduce the project.

Changes:

• Add a short README.md with project name and one-line description.
• Delete cspell.json and project-words.txt to remove cspell entirely.
• Strip the cspell hooks and the now-unneeded default_install_hook_types/default_stages defaults from .pre-commit-config.yaml.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
README.md	New minimal README introducing Vanillian.
project-words.txt	Removed project-specific cspell dictionary.
cspell.json	Removed cspell configuration file.
.pre-commit-config.yaml	Removed cspell pre-commit hooks and associated default stage settings.

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