public Builder addParam(final String key, final String value) {
            return addParams(new Param.Builder().key(key).value(value).build());
        }
Shortcut function to add a parameter and go straight back to building the query
@param key The parameter key
@param value The parameter value
@return this builder with the completed parameter added.
stroom-legacy/stroom-legacy-model_6_1/src/main/java/stroom/legacy/model_6_1/Query.java