Add benchmarks

[MatteoGioioso]

Similar to serverless-mysql it would be good to add benchmarks: https://github.com/jeremydaly/serverless-mysql#tests

[ThaungThanHan]

Hello @MatteoGioioso. By adding benchmarks, do you mean running tests with a benchmark and describe it in the README.md file of serveless-pg ?

[MatteoGioioso]

Hey, yes.
I was planning to use locust https://github.com/locustio/locust, and also a monitoring tool for checking connections status/count and TPS on Postgres side (If you use RDS you won't need it)