chapter 5: add initial samples

Chapter05/reverse-sentence/index.js

@@ -0,0 +1,8 @@
+module.exports = reverse
+
+function reverse (sentence) {
+  const wordsArray = sentence.split(' ')
+  const reversedArray = wordsArray.reverse()
+  const reversedSentence = reversedArray.join(' ')
+  return reversedSentence
+};