Readme: add more thorough instructions

Author: rubo77

README.md

@@ -3,21 +3,38 @@ Allows you to export JSON files of your most important data (questions, answers,
 
 ## Installation
 
- 1. I think this project requires PHP 7.3 or later, so be sure that your system complies.
+There is no need to clone this repository, the installation works with PHP composer.
+
+ 1. This is only tested on PHP 7.3, so be sure that your system complies.
  1. Sign up at https://stackapps.com/apps/oauth/register to receive a Client ID, Client Secret, and Key. (It's free, easy, and fast.)
- 1. Create a Laravel project, and make sure that it works: https://laravel.com/docs/5.8/installation#installing-laravel
- 1. Add this package into your Laravel project: `vagrant@vboxHomestead:~/Code/MyLaravelProject$ composer require ryancwalsh/stack-exchange-backup-laravel:dev-master --prefer-source`
- 1. Run `php artisan vendor:publish`, and if it gives you a choice, choose to publish from this package.
+ 1. Create a Laravel project, and make sure that it works:
+        https://laravel.com/docs/5.8/installation#installing-laravel
+        mkdir ~/Code/MyLaravelProject
+        cd ~/Code/MyLaravelProject
+        composer global require laravel/installer
+        # on Ubuntu 18.04 and Debian 9+:
+        echo 'export PATH="$PATH:$HOME/.config/composer/vendor/bin"' >> ~/.bashrc
+        # on other systems this might be
+        # echo 'export PATH="$PATH:$HOME/.composer/vendor/bin"' >> ~/.bashrc
+        # apply PATH:
+        source ~/.bashrc
+        # create the laravel project for this app:
+        laravel new StackExchangeBackupLaravel
+ 1. Add this package into your Laravel project:
+        composer require ryancwalsh/stack-exchange-backup-laravel:dev-master --prefer-source
+ 1. Run _artisan_ in the parent folder of the app folder, and if it gives you a choice, choose to publish from this package
+        cd StackExchangeBackupLaravel/
+        php artisan vendor:publish
  1. Edit your Laravel project's `.env` file to have your own StackApps values. A non-working sample is below.
  1. Run `php artisan exportStackExchange`. (Note that `php artisan exportStackExchange --flushCache` is an available option to clear the cached access code value.)
  1. Following the instructions in the terminal, you'll use your browser to visit a URL that will provide you with a temporary access token to paste into the terminal.
  1. Finished! The JSON files will appear in your `/storage/app/StackExchange` folder.
 
 ```
 # These are sample .env values:
-STACKAPPS_CLIENT_ID=12227
-STACKAPPS_CLIENT_SECRET=ydxGSDFHDF4DtZqCesr)yJIw((
-STACKAPPS_KEY=JuWsTgfG2CqjdghkhdgBkQ((
+STACKAPPS_CLIENT_ID=<your Client Id>
+STACKAPPS_CLIENT_SECRET=<your Client Secret>
+STACKAPPS_KEY=<your Key>
 AWS_ACCESS_KEY_ID=AKIAmb3mbn56mn6
 AWS_SECRET_ACCESS_KEY=jl234k5jl23k45j23lj5
 AWS_DEFAULT_REGION=us-east-1