Add boolean content (#6438)

Update boolean@b1HvkoWA2t4kt8mS6FySm.md

src/data/roadmaps/javascript/content/boolean@b1HvkoWA2t4kt8mS6FySm.md

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 # boolean
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+In JavaScript, a `boolean` is a simple data type that can hold one of two values: `true` or `false`. These values are used to represent logical states and are essential in controlling the flow of a program.
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+Booleans are commonly used in conditional statements (`if`, `else`, `while`, etc.) to determine whether a block of code should execute.
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+Visit the following resources to learn more:
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+- [@article@JavaScript Boolean](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Boolean)
+- [@video@Booleans in JavaScript](https://www.youtube.com/watch?v=B4ZCFdrBmbE)