Add build and deploy doc

docs/ref/getting-started/deployment/wazuh-agent.md

@@ -0,0 +1,24 @@
+# Wazuh Docker deployment
+
+## Deploy Wazuh agent
+
+1) Enter the `wazuh-agent` directory of the repository.
+```
+$ cd wazuh-agent
+```
+2) Edit the `docker-compose.yml` file, changing the current value of the `WAZUH_MANAGER_SERVER` variable to the IP or URL of the Wazuh manager:
+```
+    environment:
+      - WAZUH_MANAGER_SERVER=<WAZUH_MANAGER_IP>
+```
+3) Start the environment with docker-compose:
+
+- In the foregroud:
+```
+$ docker-compose up
+```
+
+- In the background:
+```
+$ docker-compose up -d
+```