Create plantuml note

Author: overbyte

plantuml.md

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+# Using Plant UML for creating diagrams
+
+Online Plant UML Server: http://www.plantuml.com/
+
+## Documentation
+
+* Reference Guide: http://plantuml.com/guide
+* Language Spec: https://plantuml.com/sitemap-language-specification
+* Sequence Diagram: https://plantuml.com/sequence-diagram
+
+## Help with Layout
+
+The layouts can go a bit mad with Graphviz so may require a few helpful techniques to tame them.
+
+* set direction of lines with `-u-` (up), `-d-` (down), `-l-` (left), `-r-` (right)
+* hidden lines to create hidden connections between items: `-[hidden]-`
+* grouping nodes by wrapping them with `together {}`
+* setting some connectors to be longer by adding more dashes: `---->>`
+
+### Links
+
+* https://github.com/mattjhayes/PlantUML-Examples/blob/master/docs/Layout-Techniques/other_layout_tricks.md