added graph folder and content as a prototype.. 
refer http://localhost:8080/visualizer/graphs/
Merge pull request #1 from tharindu99/visualizer-tharindu

Visualizer tharindu
Merge remote-tracking branch 'upstream/master'
updated graph
Merge pull request #8 from tharindu99/master

updated graph as prototype
before upstream
Merge remote-tracking branch 'upstream/master'