feat(solutions): add frequency-deviation/javascript/function

challenges/frequency-deviation/solutions/javascript/function/solution.js

@@ -0,0 +1,18 @@
+import readline from 'node:readline'
+
+import { getMaximumFrequencyDeviation } from './getMaximumFrequencyDeviation.js'
+
+const input = []
+const readlineInterface = readline.createInterface({
+  input: process.stdin,
+  output: process.stdout
+})
+readlineInterface.on('line', (value) => {
+  input.push(value)
+})
+
+const solution = () => {
+  console.log(getMaximumFrequencyDeviation(input[0]))
+}
+
+readlineInterface.on('close', solution)