public Builder addRule(Rule rule) {
            this.rules.get().add(rule);
            return this;
        }
Adds a rule to this ruleset. The rule be evaluated if all previous rules do not match.

@param rule The {@link Rule} to add
@return the {@link Builder}
smithy-rules-engine/src/main/java/software/amazon/smithy/rulesengine/language/EndpointRuleSet.java