Feature/graph visualization

[masalaske]

• Naive approach: cosinus similarity as weight, edge is drawn when >= threshold
• Article data visualized.
• Labels hidden due to privacy.
• Further sources documented in dedicated README.md

Only for sharepoint data plotted (not yet with other sources)

Other measures can be applied:

• degree centrality:increasing size and increasing green tone indicate higher "importance"

• We could try out how it look like, when we have all data sources together

Further use cases:

• reference and citation network of intranets (e.g. sharepoint, confluence), plot as network graph and gain insights as operator
• "who collaborates with whom in what document" - networks
• chat bot could use network properties of information and incorporate it also in it's answers