Updated Mobile Robot Instructions

moveit_tutorials @ f77a29c7

-Subproject commit f77a29c7c3281ae82c6a4d793c39bed61c45cfb4

panda_moveit_config @ 625be994

-Subproject commit 625be99465d1cf897297f0fde414f90349e3015f

universal_robot @ 6507bb67

+Subproject commit 6507bb6756d0065d49b76230ff55f875f099a827

04_MobileRobot/README.md

+# Mobile robot
+
+
+## Launching in Simulation
+
+- First install the package *turtlebot3_simulations* in your catkin workspace and build it.
+
+    ```bash
+    cd ~/catkin_ws/src/
+    ```
+
+    ```bash
+    git clone -b melodic-devel https://github.com/ROBOTIS-GIT/turtlebot3_simulations.git
+    ```
+
+    ```bash
+    cd ~/catkin_ws
+    ```
+
+    ```bash
+    catkin build
+    ```
+
+    ```bash
+    source ~/.bashrc
+    ```
+
+- Export the name of the Turtlebot model we will use to the environment variable *TURTLEBOT3_MODEL* by the following command. Make sure to source the *.bashrc* file afterwards.
+
+    ```bash
+    echo "export TURTLEBOT3_MODEL=burger" >> ~/.bashrc
+    ```
+
+    ```bash
+    source ~/.bashrc
+    ```
+
+- Now launch one of the predefined environments for `Gazebo` from the just installed **turtlebot3_gazebo** package. All the launch files with different envrionments can be listed to the terminal by the following commands.
+
+    ```bash
+    roscd turtlebot3_gazebo
+    ```
+
+    ```bash
+    ls launch
+    ```
+- For the next examples we will use the **turtlebot3_world.launch** file.
+
+    ```bash
+        roslaunch turtlebot3_gazebo turtlebot3_world.launch
+    ```
+
+## Launching a SLAM node
+
+- Launching the SLAM node
+
+    ```bash
+    roslaunch turtlebot3_slam turtlebot3_slam.launch
+    ```
+
+- Operating the node using the keyboard.
+
+    ```bash
+    roslaunch turtlebot3_teleop turtlebot3_teleop_key.launch
+    ```
+- Operate the robot using a script. Maybe you have to make to skript *simple_auto_drive.py* executable. Following instructions show you how to make it executable.
+
+    ```bash
+    roscd ~/catkind_ws/src/task_3/scripts
+    ```
+
+    ```bash
+    chmod +x simple_auto_drive.py
+    ```
+
+    ```bash
+    rosrun task_3 simple_auto_drive.py
+    ```
+    You can stop the script by typing `Ctrl` + `C` into the terminal where the node is running. 
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