Modify documentation to explain how this library differs from pg-mem and pg-lite

[slidenerd]

• I would appreciate if you can edit the documentation to mention what features your library has and how does it compare to libraries like pg-mem and pg-lite
• I have noticed that your documentation does mention pg-lite here and also talks about how it works compares to pg-lite but it would be really nice if we can see some actual benchmarks in a table and how it compares to pg-mem