doc: updated readme
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## Attention
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## Attention
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1. If the button is not used, specify any free GPIO in the initial configuration.
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1. If the button is not used, specify any free GPIO in the initial configuration.
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2. For correct operation, please enable the following settings in the menuconfig:
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```text
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GPIO_CTRL_FUNC_IN_IRAM
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```
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## Using
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## Using
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