Readme update

Author: KeiranWDigital

README.md

@@ -21,3 +21,12 @@ If you need any help, contact one of the pople who have already added themselves
 
 Copy the includes code `<br />
 {% include_relative pages-people/people-yourname.html %}` to the bottom of people.html (ensure you update the file name)
+
+# Sitemap
+All pages not defined as a default in _config.yml are added to the sitemap
+
+To exclude a specific page use the snippet `sitemap:false` at the top of the page
+
+> :warning: **If you are including the page in another page (using `include_relative`)**: add the page as a default in `_config.yml` otherwise the `sitemap:false` is displayed as HTML on the page.
+
+All files in `_include` are excluded from the sitemap automatically