Update README.md

added installation options

README.md

@@ -13,6 +13,26 @@ See also: [commandlijn](https://github.com/Command-Transport/commandlijn)
 
 ## Installation
 
+#### 1. Install via `go install`
+
+To quickly install commandtrein using go, run the following command:
+
+```bash
+go install github.com/Command-Transport/commandtrein@latest
+```
+
+This will download and install commandtrein and make it avaible in your `$GOPATH/bin` directory. Ensure that this directory is included in your system's `PATH` environment variable.
+
+#### 2. Install from source
+If you prefer to build commandtrein from source, follow these steps:
+
+```bash
+git clone https://github.com/Command-Transport/commandtrein.git
+cd commandtrein
+go build -o commandtrein
+sudo mv commandtrein /usr/local/bin/
+```
+
 ## Usage
 
 Commandtrein supports the following actions: