Add a prime number logic and readme

Author: 403-html

prime-number/README.md

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+# Prime number
+
+Determine if a number is prime or not. As an output provide boolean
+
+Sample:
+Input function: `isPrime(13)`
+Output: `true`

prime-number/isPrime.js

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+const isPrime = (n) => {
+    for (let i = 2; i < n; i++) if (n % i === 0) return false
+    return n !== 1
+}
+
+console.log(isPrime(12))
+console.log(isPrime(13))
+console.log(isPrime(11))