Plugin Walkthrough

[RedEchidnaUK]

This PR adds walkthrough documentation for building an Inventree part plugin panel.

I've created it around a basic example that (hopefully) helps guide the reader on how to do some things,

• Setup a build environment using the Plugin Creator
• Test the build environment
• Create a basic panel
• Query Inventree via the frontend
• Query Inventree via the backend
• Pass data from the backend to the frontend
• Create panel admin settings
• Add custom styling

I would be highly surprised if this PR is 100% correct first time, so please do provide feedback on what you think works or doesn't work and I'll look at changing it. Lastly, I'm not a professional software developer, which means I might well be doing something that isn't best practice and although this is far from a Python/React tutorial it would be nice not to make obvious mistakes. Again, feel free to point out those mistakes.

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[matmair]

Thank you for submitting this @RedEchidnaUK ! I will try to give it a thorough review within the next 7 days

[RedEchidnaUK]

Thanks @matmair for the update. Appreciate you taking the time.

[SchrodingersGat]

@RedEchidnaUK this is looking good! Two small suggestions, both to improve discoverability of this walkthrough

1. Add the new page to the index in "mkdocs.yml"
2. Add a link and description to the walkthrough on the "plugins/index" page

[RedEchidnaUK]

Thanks @SchrodingersGat I’ll try and take a look at this later this week.