First stab at contributing guide

[maltenuhn]

A start at some docs, mainly pulled from my chat log with Omar and focused on how our editor-state and redux architecture works (since almost all UI-level changes will probably need to touch that). It's very basic but probably better than typing this up (and losing it) in Discord

[github-actions]

Link to test editor
Scroll Canvas: 31.3ms (24.5-41.2ms) | Resize: 57.7ms (11.1-168ms) | Selection: 219.5ms (185.8-623.7ms) | Calc Pi: 29ms (28-34ms) | Empty Dispatch: 36.2ms (33.8-109.8ms) |

[Rheeseyb]

We already have https://github.com/concrete-utopia/utopia/blob/master/contributing.md - is it worth appending this to the end of that? Or alternatively starting an effort to document everything under docs/ and move the above file there?

[maltenuhn]

@Rheeseyb I didn't realise! On reading it, it seems to be mainly about rules to comply with. /docs seems like the right place (or github pages?)

[github-actions]

Link to test editor
Scroll Canvas: 33ms (24.8-65.5ms) | Resize: 60.7ms (15.6-423.2ms) | Selection: 266.5ms (208.2-576.5ms) | Calc Pi: 34ms (31-49ms) | Empty Dispatch: 38ms (33.4-134.6ms) |

[maltenuhn]

All right, I've moved this to docs. I hope it's juicy enough to attract a roving Docusaurus or two...