Make clearer we need to listen for /create-post

[thejoefriel]

At l.29 it could be useful to remind the reader that they'll need to create a way to listen out for the specific url of the form (i.e. a new else if statement).

[minaorangina]

hey @thejoefriel, do you mind linking the step you are referring to? And thanks for the feedback :)

[minaorangina]

In fact, feel free to update and make a pull request! #opensource