Easy to set up SpongeForge. However, please agree to the Minecraft End User License Agreement by yourself.
Move the sponge folder and execute the following command.
./setup.sh
Download MinecraftForge and SpongeForge. If the data folder already exists, it is zipped and moved to the backup folder. Finally MinecraftForge installation will be done. You need to agree to the EULA in order to run the server. Go to eula.txt for more info.
./run.sh