Create a Development Survival Guide

[novocaine]

We have some barebones documentation in our README but it would be great to have some more depth material explaining how to get productive quickly.

For example:

• How to setup common IDEs (e.g. VSCode, WebStorm) to work on the project - linting, debugging, running tests etc
• How to work efficiently with the multiple repositories involved
• Common errors and how to fix them

[turt2live]

A WebStorm tip: It'll probably get confused about the layers: explicitly running yarn build in each layer then excluding the build output directories manually will save your imports a little bit. It'll still probably screw up imports from the js-sdk though, so manually check that those are pointing at src rather than lib before committing (until we get rid of the horrid webpack hacks we have in place for sourcemap alignment)