mention performance in descriptions

[kanarus]

in:

• README, crate inner doc ( lib.rs )
• description in Cargo.toml
• repository description

basis:

• https://web-frameworks-benchmark.netlify.app/result?l=rust
• ( https://www.techempower.com/benchmarks in future )

[kanarus]

"intuitive and ultrafast web framework for Rust" "works on multiple runtimes"

[kanarus]

"macro free"

[kanarus]

"type safe"