Update readme.md

Add info about the procedures folder to the main usage instructions.

Merge pull request #6 from stats4sd/add-procs-and-functions

fix example procedure

Merge pull request #5 from stats4sd/add-procs-and-functions

Add procs and functions

Merge pull request #4 from stats4sd/laravel-9-support

Laravel 9 support

Merge pull request #3 from stats4sd/laravel8

updating requirements for laravel 8

Merge pull request #3 from stats4sd/laravel8

updating requirements for laravel 8

Merge pull request #3 from stats4sd/laravel8

updating requirements for laravel 8

specifying base path to allow running from controllers

specifying base path to allow running from controllers

updating links / shields for readme