ADD melodic requeriments file

dockerfiles/ws_dependencies/melodic_requirements.txt

+# Base
+ipython
+python-catkin-tools
+python-pip
+python-osrf-pycommon
+python-vcstool
+ros-melodic-catkin
+ros-melodic-plotjuggler
+ros-melodic-plotjuggler-ros
+ros-melodic-rosmon
+ros-melodic-rqt-controller-manager
+ros-melodic-rqt-joint-trajectory-controller
+# EOF