feat: new library coding interview

[excalibot]

collection of typically used diagrams in a coding interview

Submitted by deep mallick

Items: matrix, tree, tree2, array

Installation link

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[gabrielamacakova]

Hey there. I'm closing this pull request because this library appears to be very specific and does not meet the necessary quality required for publication.

When creating a new library, we recommend creating something that will be useful to most users of the Excalidraw editor.