Update README.md

README.md

@@ -13,6 +13,22 @@ and then start the service with
 `systemctl enable --now pkgs-observer-agent.service`
 `systemctl enable --now pkgs-observer-agent.timer`
 
+
+#### Add GPG key for the repository
+```bash
+wget -qO- https://packages.returnearly.net/public.asc | gpg --dearmor -o /etc/apt/keyrings/returnearly.gpg
+```
+
+#### Add repository to the sources list
+```bash
+echo "deb [arch=all signed-by=/etc/apt/keyrings/returnearly.gpg] https://packages.returnearly.net/deb stable main" | sudo tee /etc/apt/sources.list.d/returnearly.list > /dev/null
+```
+
+#### Update package lists and install the package
+```bash
+sudo apt update && sudo apt install pkgs-observer-agent -y
+```
+
 ## License
 
 This code is released under the MIT license.