fix code highlight bug.

README.md

@@ -3,11 +3,51 @@ Question2answer Formatter
 
 This plugin provides an option to add MathJax script, Prettify script and a Preview for CKEditor and enables them by default on all pages.
 
-For editor support please use this <a href="https://github.com/arjunsuresh/ckeditor-Q2A">modified ckeditor</a>.
+For editor support please use this [modified ckeditor](https://github.com/tangruize/q2a-formatter/releases).
 
-Download the ckeditor and place inside qa-plugin/wysiwyg-editor folder. Also copy qa-question.js file inside tobecopied folder to qa-content folder replacing the file present there. 
+Download the ckeditor and place inside qa-plugin/wysiwyg-editor folder. 
 
+I also recommend you to install [q2apro-warn-on-leave](https://github.com/q2apro/q2apro-warn-on-leave) plugin, which warns the user that text area has been changed when he is leaving.
 
 This is a beta code, use it at your own risk on a production environment. 
 
+# Default Configuration
+MathJax Configuration:
+```
+MathJax.Hub.Config({
+  tex2jax: {
+    inlineMath: [ [\'$\',\'$\'], ["\\\\(","\\\\)"] ],
+    config: ["MMLorHTML.js"],
+    jax: ["input/TeX"],
+    processEscapes: true
+  }
+});
 
+MathJax.Hub.Config({
+  "HTML-CSS": {
+    linebreaks: {
+      automatic: true
+    }
+  }
+});
+```
+
+MathJax URL:
+```
+https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.5/MathJax.js?config=TeX-AMS-MML_HTMLorMML
+```
+
+highlight.js URL:
+```
+https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.15.6/highlight.min.js
+```
+
+highlight.js Style URL:
+```
+https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.15.6/styles/default.min.css
+```
+
+More highlight.js and styles: https://cdnjs.com/libraries/highlight.js/
+
+
+highlight.js demo: https://highlightjs.org/static/demo/