add revision link info to README (#31)

Author: thimmy687

README.md

@@ -15,6 +15,15 @@ The cloned repository requires a `.gitreview` file, which is in use for the plug
 This file must be located in root foilder of the repository.
 Get more information about this file [here](https://docs.openstack.org/infra/git-review/installation.html#gitreview-file-format)
 
+### Revision link
+
+Using [Git Extensions revision links](https://git-extensions-documentation.readthedocs.io/settings.html#git-extensions-revision-links) you can configure how to convert parts of a revision data into clickable links.
+
+Use the following pattern to link revision data to Gerrit:
+* Search in: `Message`.
+* Search pattern: `(Change-Id: )#?I\w+`.
+* Nested pattern: `I\w{2,}`.
+
 ## GitExtensions Plugin Template infomration
 
 The [GitExtensions Plugin Template](https://github.com/gitextensions/gitextensions.plugintemplate) gives additional information about the pluign development.