Adjust README formatter section
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The JDO project uses the google-java-format for checking and reformatting the Java code to comply with
Google Java Style [Google Java Style](https://google.github.io/styleguide/javaguide.html).
+The code is formatted using the [Google Java Format](https://github.com/google/google-java-format) tool.
+The formatter can be run in the command line or can be integrated into IntelliJ or Eclipse as a plugin.
+More information on this is given in the [GJF README](https://github.com/google/google-java-format#using-the-formatter).
+
+#### Formatting using Maven
+
There are two profiles to support code formatting using the maven fmt-maven-plugin.
* `verify-format` checks the formatting of the project's Java files. It prints the list of the files that are not compliant.
