Add base DSL and update ReadMe

README.md

model_examples/.project

model_examples/.settings/org.eclipse.core.resources.prefs

model_examples/representations.aird

sgroup.mdsd.transportation_network.graphical_dsl/.classpath

sgroup.mdsd.transportation_network.graphical_dsl/.gitignore

sgroup.mdsd.transportation_network.graphical_dsl/.project

....graphical_dsl/.settings/org.eclipse.core.resources.prefs

...transportation_network.graphical_dsl/META-INF/MANIFEST.MF

...dsd.transportation_network.graphical_dsl/build.properties

...n_network.graphical_dsl/description/graphical_dsl.odesign

...p.mdsd.transportation_network.graphical_dsl/icons/CoW.png

...d.transportation_network.graphical_dsl/icons/CoW_icon.png

...p.mdsd.transportation_network.graphical_dsl/icons/CuW.png

...d.transportation_network.graphical_dsl/icons/CuW_icon.png

...up.mdsd.transportation_network.graphical_dsl/icons/GS.png

...sd.transportation_network.graphical_dsl/icons/GS_icon.png

...up.mdsd.transportation_network.graphical_dsl/icons/RS.png

...sd.transportation_network.graphical_dsl/icons/RS_icon.png

...mdsd.transportation_network.graphical_dsl/icons/other.png