insertd code of exercise2, updated project gitignore
	new file:   .cproject
	new file:   .gitignore
	new file:   .oppbuildspec
	new file:   .project
	new file:   Exercise2.anf
	new file:   TCPExample/TCPExample.ned
	new file:   TCPExample/omnetpp.ini
	new file:   UDPExample/UDPExample.ned
	new file:   UDPExample/omnetpp.ini
	new file:   package.ned