chore: update readme

Signed-off-by: Chawye Hsu <su+git@chawyehsu.com>

README.md

@@ -2,15 +2,55 @@
 
 > Hok is a CLI implementation of Scoop in Rust
 
+[![cicd][cicd-badge]][cicd]
+[![release][release-badge]][releases]
+[![license][license-badge]](LICENSE)
+
 ## Install
 
 🚧 **CAVEAT**: Under heavy development. Interfaces may change without notice, do NOT use it for production!
 
+Assuming you have the original Scoop installed, simply run:
+
 ```sh
 scoop bucket add dorado https://github.com/chawyehsu/dorado
 scoop install dorado/hok
 ```
 
+## Commands
+
+The command line interface is similar to Scoop.
+
+```
+$ hok help
+Hok is a CLI implementation of Scoop in Rust
+
+Usage: hok.exe <COMMAND>
+
+Commands:
+  bucket   Manage manifest buckets
+  cache    List or remove download caches
+  cat      Display manifest content of a package
+  cleanup  Cleanup apps by removing old versions
+  config   Configuration manipulations
+  hold     Hold package(s) to disable updates
+  home     Open the homepage of given package
+  info     Display information about a package
+  install  Install package(s)
+  list     List installed package(s)
+  search   Search available package(s)
+  unhold   Unhold package(s) to enable updates
+  update   Fetch and update all buckets
+  upgrade  Upgrade installed package(s)
+  help     Print this message or the help of the given subcommand(s)
+
+Options:
+  -h, --help     Print help
+  -V, --version  Print version
+
+Type 'hok help <command>' to get help for a specific command.
+```
+
 ## Development
 
 Prerequisites: Git, Rust
@@ -35,3 +75,9 @@ TBD
 For licenses of sub crates, see [COPYING](COPYING).
 
 > [Blog](https://chawyehsu.com) · GitHub [@chawyehsu](https://github.com/chawyehsu) · Twitter [@chawyehsu](https://twitter.com/chawyehsu)
+
+[cicd-badge]: https://github.com/chawyehsu/hok/workflows/CICD/badge.svg
+[cicd]: https://github.com/chawyehsu/hok/actions/workflows/cicd.yml
+[release-badge]: https://img.shields.io/github/v/release/chawyehsu/hok
+[releases]: https://github.com/chawyehsu/hok/releases/latest
+[license-badge]: https://img.shields.io/github/license/chawyehsu/hok