rulebook-core/src/main/java/com/deliveredtechnologies/rulebook/lang/ThenRuleBuilder.java
public ThenRuleBuilder<T, U> then(BiConsumer<NameValueReferableTypeConvertibleMap<T>, Result<U>> action) {
    _rule.addAction(action);
    return this;
  }
public ThenRuleBuilder<T, U> then(BiConsumer<NameValueReferableTypeConvertibleMap<T>, Result<U>> action) {
    _rule.addAction(action);
    return this;
  }
Addds a then action into the Rule.
@param action  an action that the rule will execute based on the condition; accepts facts and the result
@return        a builder that allows for the Rule to be built following the 'then' statement