add the benchmark result to README.

README.md

@@ -22,7 +22,76 @@ youki is named after the Japanese word 'youki', which means 'a container'. In Ja
 Here is why we are writing a new container runtime in Rust.
 
 - Rust is one of the best languages to implement the oci-runtime spec. Many very nice container tools are currently written in Go. However, the container runtime requires the use of system calls, which requires a bit of special handling when implemented in Go. This is too tricky (e.g. _namespaces(7)_, _fork(2)_); with Rust, it's not that tricky. And, unlike in C, Rust provides the benefit of memory safety. While Rust is not yet a major player in the container field, it has the potential to contribute a lot: something this project attempts to exemplify.
-- youki has the potential to be faster and use less memory than runc, and therefore work in environments with tight memory usage requirements. I don't have any benchmarks, as it is not yet fully operational, but I expect that Rust's semantics will lead to higher performance, despite the fact that current implementations such as [crun](https://github.com/containers/crun#performance), a container runtime implemented in C, already have quite high performance. For example, it may be possible to experiment with algorithmic improvements with asynchronous processing using async/await in some parts.
+- youki has the potential to be faster and use less memory than runc, and therefore work in environments with tight memory usage requirements. Here is a simple benchmark of a container from creation to deletion.
+  | Runtime |   Time (mean ± σ)   |  Range (min … max)  |
+  | :-----: | :-----------------: | :-----------------: |
+  |  youki  | 198.4 ms ±  52.1 ms | 97.2 ms … 296.1 ms  |
+  |  runc   | 352.3 ms ±  53.3 ms | 248.3 ms … 772.2 ms |
+  |  crun   | 153.5 ms ±  21.6 ms | 80.9 ms … 196.6 ms  |
+  <details>
+  <summary>Details about the benchmark</summary>
+
+    - A command used for the benchmark  
+        ```console
+        $ hyperfine --prepare 'sudo sync; echo 3 | sudo tee /proc/sys/vm/drop_caches' --warmup 10 --min-runs 100 'sudo ./youki create -b tutorial a && sudo ./youki start a && sudo ./youki delete -f a'
+        ```
+    - Enviroment  
+        ```console
+        $ ./youki info
+        Version           0.0.1
+        Kernel-Release    5.11.0-41-generic
+        Kernel-Version    #45-Ubuntu SMP Fri Nov 5 11:37:01 UTC 2021
+        Architecture      x86_64
+        Operating System  Ubuntu 21.04
+        Cores             12
+        Total Memory      32025
+        Cgroup setup      hybrid
+        Cgroup mounts
+          blkio           /sys/fs/cgroup/blkio
+          cpu             /sys/fs/cgroup/cpu,cpuacct
+          cpuacct         /sys/fs/cgroup/cpu,cpuacct
+          cpuset          /sys/fs/cgroup/cpuset
+          devices         /sys/fs/cgroup/devices
+          freezer         /sys/fs/cgroup/freezer
+          hugetlb         /sys/fs/cgroup/hugetlb
+          memory          /sys/fs/cgroup/memory
+          net_cls         /sys/fs/cgroup/net_cls,net_prio
+          net_prio        /sys/fs/cgroup/net_cls,net_prio
+          perf_event      /sys/fs/cgroup/perf_event
+          pids            /sys/fs/cgroup/pids
+          unified         /sys/fs/cgroup/unified
+        CGroup v2 controllers
+          cpu             detached
+          cpuset          detached
+          hugetlb         detached
+          io              detached
+          memory          detached
+          pids            detached
+          device          attached
+        Namespaces        enabled
+          mount           enabled
+          uts             enabled
+          ipc             enabled
+          user            enabled
+          pid             enabled
+          network         enabled
+          cgroup          enabled
+        $ ./youki --version
+        youki version 0.0.1
+        commit: 0.0.1-0-0be33bf
+        $ runc -v
+        runc version 1.0.0-rc93
+        commit: 12644e614e25b05da6fd08a38ffa0cfe1903fdec
+        spec: 1.0.2-dev
+        go: go1.13.15
+        libseccomp: 2.5.1
+        $ crun --version
+        crun version 0.19.1.45-4cc7
+        commit: 4cc7fa1124cce75dc26e12186d9cbeabded2b710
+        spec: 1.0.0
+        +SYSTEMD +SELINUX +APPARMOR +CAP +SECCOMP +EBPF +CRIU +YAJL
+        ```
+  </details>
 - The development of [railcar](https://github.com/oracle/railcar) has been suspended. This project was very nice but is no longer being developed. This project is inspired by it.
 - I have fun implementing this. In fact, this may be the most important.