Merge pull request #15 from aldy505/docs/examples

docs: examples

Merge pull request #9 from aldy505/perf/builder

perf: migrate bytes.Buffer to strings.Builder for micro optimization

Merge pull request #3 from aldy505/feat/upsert

Feat/upsert (WIP)

Merge pull request #2 from aldy505/feat/definition

feat: using a column definition builder

docs: examples for create table if not exists