Fix grammatical error Update README.md

[mdqst]

There was a small grammatical error in the "Useful commands" section of the documentation.

• Incorrect phrase: "Runs prettier format and write changes"
• Corrected phrase: "Runs prettier format and writes changes"

This change is important for proper sentence structure and readability, ensuring the instructions are clear and professional.

[changeset-bot]

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Latest commit: 179fa09

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