docs: Update README.md

Author: ahmadhuss

README.md

@@ -22,6 +22,81 @@ It will automatically find your `.env` file and place the base 64 value in the f
 APP_KEY=base64:T0huMR5Wx9EoDmjTxniKTofHD/7cOiDeVVD9eTKuCa0=
 ```
 
+## Additional Note:
+As you can see it is necessary to create the `.env` file in your local to bootstrap the project. But `Laravel` contains 2 methods to connect to the database server.
+
+- Use of the `.env` variables *(I prefer this one)*
+- Use of the file located at the `config/database.php`
+
+
+
+## Use of the `.env` variables:
+
+When you create this file with copy paste credentials you can see default the database variables are written something like this:
+ ```
+DB_CONNECTION=mysql  
+DB_HOST=127.0.0.1  
+DB_PORT=3306  
+DB_DATABASE=test_app  
+DB_USERNAME=root  
+DB_PASSWORD=
+```
+
+You can edit values according to your own database personal preference. I am using Postgres in this case.
+
+##  Use of the file located at the `config/database.php`
+
+**Note:** When Laravel bootstraps the project it gives priority to the `.env` file as compared to `config/**` files. You can see `config/database` file contains an associated array with default database settings like this.
+
+```
+return [
+    
+    'default' => env('DB_CONNECTION', 'mysql'),
+    'connections' => [
+        'mysql' => [
+            'driver' => 'mysql',
+            'url' => env('DATABASE_URL'),
+            'host' => env('DB_HOST', '127.0.0.1'),
+            'port' => env('DB_PORT', '3306'),
+            'database' => env('DB_DATABASE', 'forge'),
+            'username' => env('DB_USERNAME', 'forge'),
+            'password' => env('DB_PASSWORD', ''),
+            'unix_socket' => env('DB_SOCKET', ''),
+            'charset' => 'utf8mb4',
+            'collation' => 'utf8mb4_unicode_ci',
+            'prefix' => '',
+            'prefix_indexes' => true,
+            'strict' => true,
+            'engine' => null,
+            'options' => extension_loaded('pdo_mysql') ? array_filter([
+                PDO::MYSQL_ATTR_SSL_CA => env('MYSQL_ATTR_SSL_CA'),
+            ]) : [],
+        ],
+    ]
+    ]
+```
+
+You can only use these settings if variables from the `.env` file will be deleted. Otherwise, Laravel gives priority to `.env` variables.
+
+Delete the variables from the `.env`:
+
+
+~~DB_CONNECTION=mysql~~  
+~~DB_HOST=127.0.0.1~~  
+~~DB_PORT=3306~~  
+~~DB_DATABASE=test_app~~  
+~~DB_USERNAME=root~~  
+~~DB_PASSWORD=~~
+
+Lastly, Update the `config/database.php` with your database server settings:
+
+```
+'default' => env('DB_CONNECTION', 'pgsql')
+'database' => env('DB_DATABASE', 'shop_test'),
+'username' => env('DB_USERNAME', 'postgres'),
+'password' => env('DB_PASSWORD', 'a')
+```
+
 # Database
 In my case I am using  **Postgres** and inside `.env` file my database server creditenials are:
 ```
@@ -37,3 +112,7 @@ However, your main server and database server get started.
 
 # Template I am using
 [Download Link](https://startbootstrap.com/template/shop-homepage)
+
+# Deployment
+[Heroku](https://www.heroku.com)
+