doc: Update README.md

README.md

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 Copybook Generator aims to help users easily generate copybook templates that meet their individual needs through flexible customization options and diverse functions, enhancing their writing skills. Whether you are a beginner or a writing enthusiast, you can benefit from it and enjoy the fun of writing practice.
 
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+site: Copybook Generator
 title: Copybook Generator is a powerful copybook generation tool designed to meet the writing practice needs of different users - 
 keywords: Copybook Generator, Chinese Practice, Alphabet Practice, Stroke Order, Custom Copybooks
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