How to create custom rules via the RHAMT?

Issue

We are trying to use the RHAMT to analyse application code in preparation to for the move from EAP 6.4 to EAP 7.1.
How does one add custom rules to the tool?

For example,
I would like it flagged when a certain annotation is detected. Like below:

@DefaultBean
Class someClass{
}

or when a certain method is called

entity.getTransaction

With a custom message explaining the steps to correct this.