public Builder addParam(final String key, final String value) {
            return addParams(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-query/stroom-query-api/src/main/java/stroom/query/api/Query.java