Add to Benchmarks

[sirinath]

Can this be added o benchmarks so it can be compared with the other frameworks:

• https://www.techempower.com/benchmarks/
• https://web-frameworks-benchmark.netlify.app/result?asc=0&order_by=level64
• etc.

[SergioBenitez]

I have no reservations about Rocket appearing in any benchmark suite, but it's not something I think the project should take on itself. See my previous comments about the matter in #710 (comment).