chapter 5: add initial samples

Chapter05/reverse-sentence/README.md

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+# reverse-sentence
+
+Reverses the words of a sentence.
+
+## Install
+```sh
+npm install @bethany.griggs/reverse-sentence
+```
+
+## API
+
+```js
+require('reverse') => Function
+reverse(sentence) => String
+```
+
+## Example
+```js
+const reverseSentence = require('reverse-sentence');
+
+const sentence = "Hello Beth!"; 
+
+const reversed = reverseSentence(sentence); 
+
+console.log(reversed) // Beth! Hello
+```
+
+## License
+
+MIT