Adding notes on libgazebo-dev

Author: ruffsl

gazebo/content.md

@@ -43,7 +43,11 @@ One thing to be careful about is that gzserver logs to files named `/root/.gazeb
 
 ### Devices
 
-As of Gazebo version 5.0, physics simulation under a headless instances of gzserver works fine. However some application may require image rendering camera views and ray traces for other sensor modalities. For Gazebo, this requires a running X server for rendering and capturing scenes. In addition, graphical hardware acceleration is also needed for reasonable realtime framerates. To this extent, mounting additional graphic devices into the container and linking to a running X server is required. In the interest of maintaining a general purpose and minimalistic image which is not tightly coupled to host system software and hardware, we do not include tags here with these additional requirements and instructions. You can however use this repo to build and customize your own images to fit your software/hardware configuration. The OSRF's Docker Hub organisation profile contains a Gazebo repo at [osrf/gazebo](https://registry.hub.docker.com/u/osrf/gazebo/) which is based on this repo but includes additional tags for these advanced use cases.
+As of Gazebo version 5.0, physics simulation under a headless instances of gzserver works fine. However some application may require image rendering camera views and ray traces for other sensor modalities. For Gazebo, this requires a running X server for rendering and capturing scenes. In addition, graphical hardware acceleration is also needed for reasonable realtime framerates. To this extent, mounting additional graphic devices into the container and linking to a running X server is required. In the interest of maintaining a general purpose and minimalistic image which is not tightly coupled to host system software and hardware, we do not include tags here with these additional requirements and instructions. You can however use this repo to build and customize your own images to fit your software/hardware configuration. The OSRF's Docker Hub organization profile contains a Gazebo repo at [osrf/gazebo](https://registry.hub.docker.com/u/osrf/gazebo/) which is based on this repo but includes additional tags for these advanced use cases.
+
+### Development
+
+If you not only wish to run Gazebo, but develop for it too, i.e. compile custom plug-ins or build upon messaging interfaces for ROS, this will require the development package included in the `libgazebo` tag. If you simply need to run Gazebo as a headless server, then the `gzserver` tag consist of a smaller image size.
 
 ## Deployment example