docs: describe options.createDirsFromUpload

Author: GrosSacASac

README.md

@@ -340,6 +340,8 @@ See it's defaults in [src/Formidable.js DEFAULT_OPTIONS](./src/Formidable.js)
 - `options.filter` **{function}** - default function that always returns true.
   Use it to filter files before they are uploaded. Must return a boolean.
 
+- `options.createDirsFromUploads` **{boolean}** - default false. If true, makes direct folder uploads possible. Use `<input type="file" name="folders" webkitdirectory directory multiple>` to create a form to upload folders. Has to be used with the options `options.uploadDir` and `options.filename` where `options.filename` has to return a string with the character `/` for folders to be created. The base will be `options.uploadDir`.
+
 
 #### `options.filename`  **{function}** function (name, ext, part, form) -> string