Add ProducesResponseType attribute

Author: adudek-bw

src/Api/Tools/Controllers/SendsController.cs

@@ -70,6 +70,10 @@ IHasPremiumAccessQuery hasPremiumAccessQuery
 
     [AllowAnonymous]
     [HttpPost("access/{id}")]
+    [ProducesResponseType<SendAccessResponseModel>(StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status400BadRequest)]
+    [ProducesResponseType(StatusCodes.Status401Unauthorized)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
     public async Task<SendAccessResponseModel> Access(string id, [FromBody] SendAccessRequestModel model)
     {
         // Uncomment whenever we want to require the `send-id` header