[ROS Q&A] 051 - Turtlebot 3 Laser Scan subscription

More ROS Learning Resources: https://goo.gl/DuTPtK
Q: Subscribe to a Gazebo topic and publish in a ROS node

A: If you are working with that [turtlebot3 simulation](https://turtlebot3.readthedocs.io/en/latest/simulation.html), you don't have to subscribe a gazebo topic, since the simulation is configured already with ROS.

To subscribe the laser scanner and publish something else in the same node, you can do the following:

Create a pkg with these dependencies

---------Want to learn ROS really FAST and master the latest Robotics topics?-----------
::Visit Robot Ignite Academy, the online Academy that teaches you ROS really FAST, from beginner to master, using only a web browser:https://goo.gl/LBT7EN
Robot Ignite Academy is an integrated ROS learning platform which contains a series of online ROS tutorials tied to online simulations, giving you the tools and knowledge to understand and create any ROS based robotics development.

-----------Are you a ROS expert and want to develop FAST your next ROS project?-----------
:: Then, use the ROS Development Studio (RDS) for your next project:https://goo.gl/EtFqmEWith the ROS Development Studio, you will be able to:
- Develop ROS programs for robots in a faster way, with an already setup IDE environment that includes autocomplete. - Test the programs in real time on the provided simulated robots. Use the provided simulations or upload your own. Quickly see the results of your programming.
- Debug using graphical ROS tools.
- Test what you have developed on RDS in the real robot (if you have it :wink: all of these are using ONLY a web browser without any installation and not limited by any operating system. DEVELOP FOR ROS USING WINDOWS, LINUX OR OSX.