Update the diagram in README.MD

[fdesbiens]

The diagram found in README.MD was inherited from Microsoft and must be replaced by an Eclipse-branded one.

I exported the relevant slides in this document: https://docs.google.com/presentation/d/1g_SLliZ6WRKbKtrx2kmlHbKpmjlTQdf9ovyr8EXqi8Y

Please create a PNG of the relevant diagram and replace the existing one.