Added reference to new property in readme file.

README.md

@@ -260,6 +260,7 @@ architecture model:
 | `generatr.style.colors.secondary`       | Secondary site color, used for font color in header bar and for active menu.                                                                                                                                                                                                         | `#cccccc` | `#ffffff`           |
 | `generatr.style.faviconPath`            | Site logo location relative to the configured `assets` folder. When configured, the logo image will be place on the left side in the header bar. This requires the `--assets-dir` switch when generating the site and the corresponding file to be available in the `assets` folder. |           | `site/favicon.ico`  |
 | `generatr.style.logoPath`               | Site favicon location relative to the configured `assets` folder. When configured, the favicon will be set for all generated pages. This requires the `--assets-dir` switch when generating the site and the corresponding file to be available in the `assets` folder.              |           | `site/logo.png`     |
+| `generatr.style.customCSSPath`          | Site custom css location relative to the configured `assets` folder. When configured this css file will be loaded for all pages. This requires the `--assets-dir` switch when generating the site and the corresponding file to be available in the `assets` folder.                 |           | `site/custom.css`   |
 | `generatr.search.language`              | Indexing/stemming language for the search index. See [Lunr language support](https://github.com/olivernn/lunr-languages)                                                                                                                                                             | `en`      | `nl`                |
 | `generatr.markdown.flexmark.extensions` | Additional extensions to the markdown generator to add new markdown capabilities. [More Details](https://avisi-cloud.github.io/structurizr-site-generatr/main/extended-markdown-features/)                                                                                           | Tables    | `Tables,Admonition` |
 | `generatr.svglink.target`               | Specifies the link target for element links in the exported svg                                                                                                                                                                                                                      | `_top`    | `_self`             |