feat: new library Engineers Toolbox

[excalibot]

Illustrations i use to make notes time and again

Submitted by @hubert3158

Items: box

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.

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