Add captcha image generation functionality.

routes/api-v1.php

@@ -13,3 +13,5 @@ use Illuminate\Support\Facades\Route;
 | be assigned to the "api" middleware group. Make something great!
 |
 */
+
+Route::get('/captcha', [\App\Http\Controllers\Api\V1\CaptchaController::class, 'getCaptcha']);