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"), [], []);
     }
 

src/SchemaBuilder/SchemaBuilder.php

@@ -12,7 +12,7 @@ class SchemaBuilder
     /**
      * Goes through the Attribute classes and makes a list of all the Properties they have.
      * This is so if a user adds another variable to the Attribute constructor, it won't appear in the final Schema.
-     * 
+     *
      * @return array[]
      */
     private static function GetValidKeys(): array