Feature Request: Expand manual for troubleshooting guide

[ErikKoppenhagen]

Using OSGiViz for the first time, I missed a troubleshhoting guide for common mistakes.
E.g. I had the problem, that the graph for a model just showed a box containing XML text. (This could be fixed by opening the model with an xml/xmi editor in eclipse instead of the text editor, which is used by default).
I assume there are some more things like that which can be collected in a troubleshooting section.

[NiklasRentzCAU]

How to open the model correctly is already mentioned in the readme of this repository, so this problem could be circumvented by following that guide when installing and first using the visualization.
I will keep this issue however to remind myself that the tool needs some more documentation on how to use and how to understand the visualization.