Notes on local testing and committing to the package

[peterjthomson]

For Maintainers: If we have a pull request from an external fork, here are some notes on how to test the fork...

1. Get the Demo app running. (May need: composer, env, key, seeder, npm install and npm build)

2. Install the fork version of the package.

3. Composer config to point to the local files:

composer config repositories.local '{"type": "path", "url": "../laravel-chartjs"}' --file composer.json

5. Composer.json for the package needs a stability tag, then composer.json for the app needs to be switched to "@dev" - note the at symbol