added `MimeType` as as a Field

src/SchemaBuilder/Attributes/SchemaDocumentField.php

@@ -16,18 +16,21 @@ class SchemaDocumentField extends Attribute
     public string $Comment;
     public array $ValidSchemas;
     public int $MaxSize;
+    public string $MimeType;
 
     public function __construct(
         string $Name,
         SchemaFieldExistence $Existence = SchemaFieldExistence::MAY,
         string $Comment = "",
         array $ValidSchemas = [],
-        int $MaxSize = 0
+        int $MaxSize = 0,
+        string $MimeType = "",
     )
     {
         $this->Existence = $Existence;
         $this->Comment = $Comment;
         $this->ValidSchemas = $ValidSchemas;
+        $this->MimeType = $MimeType;
         parent::__construct(new Name("SchemaDocumentField"), [], []);
     }