Add DEVELOPMENT.md

[a-roberts]

For #23, review comments, testing and feedback welcome, it references using Dockerfile_test which is at PR #21 and should be merged first.

@jessm12 @dibbles please take a look 👼.

[a-roberts]

Think I've addressed all of the comments now, @dibbles can you please take a look again and @skaegi if you're happy too let's get this merged or further worked on?

Feedback welcome, perhaps we want to mention more about the frontend now? I'm a backend coder rn so likely missed loads - what else should we be adding? Thanks

[AlanGreene]

/lgtm

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[jessm12]

Looks good, just a few minor change comments from me 🙂

[jessm12]

/approve

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[bobcatfish]

😻