Add Turkish normalizer

[tkhshtsh0917]

Pull Request

Related issue

Fixes #294

What does this PR do?

• Add Turkish normalizer definition & tests.
• Update README.md.

PR checklist

Please check if your PR fulfills the following requirements:

• [x] Does this PR fix an existing issue, or have you listed the changes applied in the PR description (and why they are needed)?
• [x] Have you read the contributing guidelines?
• [x] Have you made sure that the title is accurate and descriptive of the changes?

Thank you so much for contributing to Meilisearch!

[meili-bors[bot]]

Build succeeded:

• Run Clippy
• Run Rustfmt
• tests

[niyazialpay]

sorry this is not working, same problem still persist

[curquiza]

@niyazialpay can you open an issue with the details of your context (version, what you did, what you get, what you expect)?