Order exercise folders

Ordered the exercise folders by placing their numbers in their folder name

03 reverseString/README.md

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+# Exercise 03 - Reverse a String
+
+Pretty simple, write a function called `reverseString` that returns its input, reversed!
+
+```javascript
+reverseString('hello there') // returns 'ereht olleh'
+```
+
+You will notice in this exercise that there are multiple tests, after making the first one pass, enable the others one by one by deleting the `.skip` in front the `test.skip()` function.
+
+## Hints
+Strings in JavaScript cannot be reversed directly so you're going to have to split it into something else first.. do the reversal and then join it back together into a string.

03 reverseString/reverseString.js

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+const reverseString = function() {
+
+};
+
+module.exports = reverseString;

03 reverseString/reverseString.spec.js

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+const reverseString = require('./reverseString')
+
+describe('reverseString', () => {
+  test('reverses single word', () => {
+    expect(reverseString('hello')).toEqual('olleh');
+  });
+
+  test.skip('reverses multiple words', () => {
+    expect(reverseString('hello there')).toEqual('ereht olleh')
+  })
+
+  test.skip('works with numbers and punctuation', () => {
+    expect(reverseString('123! abc!')).toEqual('!cba !321')
+  })
+  test.skip('works with blank strings', () => {
+    expect(reverseString('')).toEqual('')
+  })
+});