Update README.md
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### This project provides a graphical interface that users can use to simulate the output from combinations of several inputs.
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* function of each button
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* Function of each button
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  1. `IN`: Generate an input block. Double click it to select the type of input.
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  2. `OUT`: Generate an output block.
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  3. `AND`: Generate an AND block, which performs function of logic and.
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