Add cli install section

Author: RetGal

content/en/setup/_index.md

@@ -7,5 +7,51 @@ menu:
     weight: 1
 ---
 
-## Install
+## Install the Dagger CLI
+
+### Linux
+
+Download and install the latest `dagger` version:
+
+```bash
+curl -L https://dl.dagger.io/dagger/install.sh | BIN_DIR=$HOME/.local/bin sh
+```
+
+Verify:
+
+```bash
+which dagger
+~/.local/bin/dagger
+
+dagger version
+dagger v0.12.3 (registry.dagger.io/engine) linux/amd64
+```
+
+### macOS
+
+Install the latest `dagger` version using `homebrew`:
+
+```bash
+brew install dagger/tap/dagger
+```
+
+Or using `sh` and `curl`:
+
+```bash
+cd /usr/local
+curl -L https://dl.dagger.io/dagger/install.sh | sh
+```
+
+Verify:
+
+```bash
+which dagger
+/opt/homebrew/bin/dagger
+
+dagger version
+dagger v0.12.3 (registry.dagger.io/engine:v0.12.3) darwin/arm64
+```
+
+
+