Please add instructions for developing and testing the plugin on figma

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[maximilianMairinger]

See https://help.figma.com/hc/en-us/articles/360042786733-Create-a-plugin-for-development for how to add it under development to your figma desktop app.

The setup is inspired by this guide: https://www.figma.com/plugin-docs/plugin-quickstart-guide/. The only difference is that npm run dev is the command you need to run to watch for changes and compile on save (so for devdelopment). Before publishing run npm run build. You need to run npm i before these commands work, for further details please refer to the link.