add registration api and unit test registration

app/Domain/UserManagements/Application/UserApplication.php

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+<?php
+namespace App\Domain\UserManagements\Application;
+
+use App\Domain\UserManagements\Model\UserModel;
+use App\Domain\UserManagements\Repositories\UserRepository;
+use Illuminate\Support\Facades\Hash;
+
+class UserApplication
+{
+    protected $userRepository;
+    public function __construct(UserRepository $userRepository)
+    {
+        $this->userRepository = $userRepository;
+    }
+
+    public function register(UserModel $model)
+    {
+        $model->avatar = "https://ui-avatars.com/api/?name=" . urlencode($model->name);
+        $model->password = Hash::make($model->password);
+        return $this->userRepository->register($model);
+    }
+}

app/Domain/UserManagements/Model/UserModel.php

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+<?php
+namespace App\Domain\UserManagements\Model;
+
+class UserModel
+{
+    public $name;
+    public $email;
+    public $password;
+    public $avatar;
+    public $created_by;
+    public $updated_by;
+
+    public function toArray(){
+        return get_object_vars($this);
+    }
+}

app/Domain/UserManagements/Repositories/UserRepository.php

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+<?php
+namespace App\Domain\UserManagements\Repositories;
+
+use App\Domain\UserManagements\Model\UserModel;
+use App\Models\User;
+
+class UserRepository
+{
+    protected $model;
+
+    public function __construct(User $model)
+    {
+        $this->model = $model;
+    }
+
+    public function register(UserModel $model)
+    {
+        $this->model->name = $model->name;
+        $this->model->email = $model->email;
+        $this->model->password = $model->password;
+        $this->model->avatar = $model->avatar;
+        $this->model->save();
+
+        return $this->model->only(['id', 'name', 'email', 'created_at']);
+    }
+}