execute Data structuer

[elonezra]

• [x] edge_data.java - @dean985

• [ ] node_data.java - @elonezra

• [ ] graph.java -

DGraph is implementing the interface graph ( a directed weighted graph) Weighted Graph - https://he.wikipedia.org/wiki/%D7%92%D7%A8%D7%A3_%D7%9E%D7%9E%D7%95%D7%A9%D7%A7%D7%9C

[dean985]

First draft of Edge is done.