feat: rewrite programming-challenges CLI (#3)

challenges/camel-case/solutions/javascript/function/README.md

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+# camel-case/javascript/function
+
+Created by [@Divlo](https://github.com/Divlo) on 6 June 2021.

challenges/camel-case/solutions/javascript/function/package.json

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+{
+  "type": "module"
+}

challenges/camel-case/solutions/javascript/function/solution.js

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+import readline from 'readline'
+
+const input = []
+const readlineInterface = readline.createInterface({
+  input: process.stdin,
+  output: process.stdout
+})
+readlineInterface.on('line', (value) => {
+  input.push(value)
+})
+readlineInterface.on('close', solution)
+
+function solution() {
+  const string = input[0]
+  const output = string
+    .trim()
+    .split(' ')
+    .map((word, index) => {
+      const isFirstElement = index === 0
+      if (isFirstElement) {
+        return word
+      }
+      return word[0].toUpperCase() + word.slice(1)
+    })
+    .join('')
+  console.log(output)
+}