Add benchmarks

benchmarks/README.md

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+# Kemal Benchmark
+
+## Installation
+
+You will need to install [wrk](https://github.com/wg/wrk/blob/master/INSTALL) in order to run the benchmarks.
+
+## Running
+
+To run the benchmarks, run `run`.
+
+The output will look something like this:
+
+```
+Building app...
+Starting app...
+2025-08-13T13:50:39.080477Z   INFO - kemal: [development] Kemal is ready to lead at http://0.0.0.0:3000
+Running benchmark...
+Running 5s test @ http://0.0.0.0:3000
+  8 threads and 50 connections
+  Thread Stats   Avg      Stdev     Max   +/- Stdev
+    Latency     1.09ms  181.77us   4.30ms   82.42%
+    Req/Sec     5.52k   532.67     7.04k    70.02%
+  223578 requests in 5.10s, 33.48MB read
+Requests/sec:  43842.96
+Transfer/sec:      6.56MB
+2025-08-13T13:50:46.183382Z   INFO - kemal: Kemal is going to take a rest
+```
+
+### Tip: Save the results to a file
+
+You can use `run > results.log` to save the results to a file `results.log`.

benchmarks/run

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+#!/bin/bash
+
+
+shards install
+
+echo "Building app..."
+
+crystal build --release -o app src/app.cr
+
+echo "Starting app..."
+
+./app &
+APP_PID=$!
+sleep 2
+
+echo "Running benchmark..."
+
+wrk -t8 -c50 -d5s http://0.0.0.0:3000
+kill $APP_PID

benchmarks/shard.yml

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+name: kemal-benchmark
+version: 0.1.0
+
+authors:
+  - Serdar Dogruyol <[email protected]>
+
+dependencies:
+  kemal:
+    github: kemalcr/kemal
+    branch: master
+
+crystal: ">= 0.36.0"
+
+license: MIT

benchmarks/src/app.cr

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+require "kemal"
+
+logging false
+
+get "/" do
+  "Hello World"
+end
+
+Kemal.run