add example with rules

[harveyl888]

include example of constructing a query containing predefined rules

[harveyl888]

code:

    queryBuilder(filters = list(list(name = 'name', type = 'string', input = 'selectize', values = c('bob', 'alice')),
                                list(name = 'name_no_vals', type = 'string', input = 'selectize'),
                                list(name = 'id', type = 'string')),
                 rules = jsonlite::toJSON(list(
                   condition = 'OR',
                   rules = list(list(id = 'id', operator = 'equal', value = 'my id'),
                                list(id = 'name', operator = 'in', value = list('bob')))),
                   auto_unbox = TRUE))

works for first rule but not second.

jsonlite::toJSON(list(
                   condition = 'OR',
                   rules = list(list(id = 'id', operator = 'equal', value = 'my id'),
                                list(id = 'name', operator = 'in', value = list('bob')))),
                   auto_unbox = TRUE)

yields

{"condition":"OR","rules":[{"id":"id","operator":"equal","value":"my id"},{"id":"name","operator":"in","value":["bob"]}]}