update docs

Author: jippi

README.md

@@ -8,6 +8,17 @@
 > SCM engine can be run either as a regular CI job in your pipeline, or be triggered through the Webhook system, allowing for versatile and flexible deployments.
 
 - [Installation](#installation)
+  - [Docker](#docker)
+  - [homebrew tap](#homebrew-tap)
+  - [apt](#apt)
+  - [yum](#yum)
+  - [snapcraft](#snapcraft)
+  - [scoop](#scoop)
+  - [aur](#aur)
+  - [deb, rpm and apk packages](#deb-rpm-and-apk-packages)
+  - [go install](#go-install)
+- [Usage](#usage)
+  - [GitLab-CI pipeline](#gitlab-ci-pipeline)
 - [Commands](#commands)
   - [`evaluate`](#evaluate)
 - [Configuration file](#configuration-file)
@@ -42,7 +53,65 @@
 
 ## Installation
 
-TODO
+### Docker
+
+```shell
+docker run --rm ghcr.io/jippi/scm-engine
+```
+
+### homebrew tap
+
+```shell
+brew install jippi/tap/scm-engine
+```
+
+### apt
+
+```shell
+echo 'deb [trusted=yes] https://pkg.jippi.dev/apt/ * *' | sudo tee /etc/apt/sources.list.d/scm-engine.list
+sudo apt update
+sudo apt install scm-engine
+```
+
+### yum
+
+```shell
+echo '[scm-engine]
+name=scm-engine
+baseurl=https://pkg.jippi.dev/yum/
+enabled=1
+gpgcheck=0' | sudo tee /etc/yum.repos.d/scm-engine.repo
+sudo yum install scm-engine
+```
+
+### snapcraft
+
+```shell
+sudo snap install scm-engine
+```
+
+### scoop
+
+```shell
+scoop bucket add scm-engine https://github.com/jippi/scoop-bucket.git
+scoop install scm-engine
+```
+
+### aur
+
+```shell
+yay -S scm-engine-bin
+```
+
+### deb, rpm and apk packages
+
+Download the `.deb`, `.rpm` or `.apk` packages from the [releases page](https://github.com/jippi/scm-engine/releases) and install them with the appropriate tools.
+
+### go install
+
+```shell
+go install github.com/jippi/scm-engine/cmd@latest
+```
 
 ## Usage