Adds Fela + Nextjs Example

[theghostyced]

Description

Simple one, we simply add a link to an example where Fela was used with Next js 🙂

Example

https://github.com/vercel/next.js/tree/master/examples/with-fela

Quality Assurance

You can also run yarn run check to run all 4 commands at once.

• The code was formatted using Prettier (yarn run format)
• The code has no linting errors (yarn run lint)
• All tests are passing (yarn run test)
• There are no flow-type errors (yarn run flow)

Changes

If one of the following checks doesn't make sense due to the type of PR, just check them.

• Tests have been added/updated
• Documentation has been added/updated
• My changes have proper flow-types

[robinweser]

Thanks for adding the link :)