Include config as code example in documentation

One more place to help users as they configure the plugin.

README.md

@@ -12,8 +12,21 @@ The formatter uses [CommonMark](https://commonmark.org/).
 
 ## Getting started
 
-In Manage Jenkins -> Security -> Markup Formatter
-select "Markdown Formatter" from the drop down list.
+In Manage Jenkins -> Security -> Markup Formatter select "Markdown Formatter" from the drop down list.
+
+Markdown syntax highlighting is enabled by default while editing the markdown text in the Jenkins pages.
+A configuration checkbox is available in the "Security" page to disable syntax highlighting while editing markdown text in Jenkins.
+
+## Configuration as code
+
+The [configuration as code plugin](https://plugins.jenkins.io/configuration-as-code/) can define the markup formatter and its configuration.
+
+```yaml
+jenkins:
+  markupFormatter:
+    markdownFormatter:
+      disableSyntaxHighlighting: false
+```
 
 ## Contributing