Needs a section on database crates

[bishtawi]

One important section I noticed missing is database related crates.

Just to kick off the list, here are some popular database libraries:

• SQLx: Async SQL library with support for PostgreSQL, MySQL, SQLite, and MSSQL
• SeaQuery: SQL query builder
• SeaORM: Async ORM (built on top of SQLx and SeaQuery)
• Diesel: Sync ORM