add Gazebo Harmonic including ROS 2 Jazzy section

Author: jgvictores

docs/install-gazebo.md

@@ -5,6 +5,21 @@ This page refers to the current versions of Gazebo (Gazebo Sim). Legacy document
 - Official page: <https://gazebosim.org>
 - Official installations page: <https://gazebosim.org/docs/all/getstarted/>
 
+## Install Gazebo Harmonic (Ubuntu)
+
+Follow the steps on <https://gazebosim.org/docs/harmonic/install_ubuntu/>
+
+### Gazebo Harmonic + ROS 2 Jazzy (Ubuntu 24.04 Noble)
+
+```bash
+sudo apt install ros-jazzy-gz-ros2-*
+```
+
+More info:
+
+- <https://github.com/gazebosim/ros_gz/tree/jazzy/ros_gz_sim_demos>
+- <https://gazebosim.org/docs/harmonic/ros2_integration/>
+
 ## Install Gazebo Fortress (Ubuntu)
 
 Follow the steps on <https://gazebosim.org/docs/fortress/install_ubuntu/>