Add user invitation facilities RSM-5

Adds user invitation to teams, and framework for assigning taems
Also adds user acc. deletion.

app/Services/VacancyApplicationService.php

@@ -0,0 +1,35 @@
+<?php
+
+namespace App\Services;
+
+use App\Vacancy;
+use App\Application;
+
+class VacancyApplicationService
+{
+
+    /**
+     * Finds all applications associated with $model.
+     *
+     * @param Vacancy $model The model you want to search through.
+     * @return Illuminate\Support\Collection A collection of applications
+     */
+    public function findApplications(Vacancy $model)
+    {
+
+        $applications = collect([]);
+
+        foreach(Application::all() as $application)
+        {
+            if ($application->response->vacancy->id == $model->id)
+            {
+                $applications->push($application);
+            }
+        }
+
+        return $applications;
+
+    }
+
+
+}