Create PlantUML examples

@jandt-desy This is how I could imagine to structure this project. I started by adding examples for PlantUML.

@frust45 that looks good for me!

• Shall I do some more of the examples?
• A short description on how to optimally create own gitlab projects based on this would perhaps help (even if this is as simple as: create new empty project and put any of the examples here in any new md file in your project)
• A colorful minimalistic example plot directly in readme.md might look nice (if anyone has an idea)...

added 1 commit

• 7ccbee4d - Add mindmap about Helmholtz research fields

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added 2 commits

• 59e48bef - Add a nice example visualization in the README
• 2da64b61 - Merge branch 'fancy-wordcloud' into 'plantuml'

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mentioned in issue #1 (closed)

mentioned in merge request !3 (merged)

added 12 commits

• cc70289a - change order of readme.md
• 9c5523f7 - split into smaller chunks
• 7dfbfdc3 - add blockdiag
• d05bc4c6 - graphviz
• c19799b1 - vega barchart
• 56c0d233 - vega 2
• b30c5aed - allow to remove demo plot (details, default open)
• 6507b78b - refs to graphiz, blockdiag
• 9edd3b59 - add mermaid diagrams
• 0f7805fe - hint in readme.md that kroki is not necessary for all graph types (not for...
• 580b682e - Merge branch 'add-mermaid' into 'mods-uj'
• a813272f - Merge branch 'mods-uj' into 'plantuml'

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resolved all threads

merged

mentioned in commit 5f9de248