Add api usage example

[joegregory-cbe]

Add an Example with the following criterias:

• How to create a new cv document
• Load the last cv document automatically when revisiting the generator again

[joegregory-cbe]

Please checkout the source code, it's more a inspiration how you could solve the creation flow. The example follows the flow below

• When the user clicks the "Create CV now!" link on the landingpage
  • Then the user gets redirected to the page /documents
• On the /documents page there is a check
  • When there a document id stored in the localstorage from a previous session?
    • Then ask the user if likes to continue or to create a new cv
  • Else
    • Create a new document on the api server and redirect the user to the DocumentEdit page with the generated id from the api response
• When the user hits the document edit page and the data was fetched successfully the document id gets written into the localstorage

See here https://github.com/coding-bootcamps-eu/23-january-final-project/tree/3-add-api-usage-example/src