Implement PHP CS Fixer and a coding standard to follow (#471)

* Create PHP CS Fixer config and add to CI workflow

* Run php cs fixer on project

* Add newline at end of file

* Update to use PHP CS Fixer v3

* Run v3 config on project

* Run seperate config in CI

app/Http/Requests/ExpenseRequest.php

@@ -25,20 +25,20 @@ class ExpenseRequest extends FormRequest
     {
         return [
             'expense_date' => [
-                'required'
+                'required',
             ],
             'expense_category_id' => [
-                'required'
+                'required',
             ],
             'amount' => [
-                'required'
+                'required',
             ],
             'user_id' => [
-                'nullable'
+                'nullable',
             ],
             'notes' => [
-                'nullable'
-            ]
+                'nullable',
+            ],
         ];
     }
 }